[RFC v1 PATCH 0/3] support soc_device_match to return -EPROBE_DEFER

[RFC v1 PATCH 0/3] support soc_device_match to return -EPROBE_DEFER

[Alice Guo (OSS)]

From: Alice Guo <alice.guo@nxp.com>

In patch "soc: imx8m: change to use platform driver", change soc-imx8m.c to use
module platform driver and use NVMEM APIs to ocotp register, the reason is that
directly reading ocotp egister causes kexec kernel hang because kernel will
disable unused clks after kernel boots up. This patch makes the SoC driver
ready. This patch makes the SoC driver ready later than before, and causes device
depends on soc_device_match() for initialization are affected, resulting in
kernel boot error.

CAAM driver is one of these affected drivers. It uses soc_device_match() to find
the first matching entry of caam_imx_soc_table, if none of them match, the next
instruction will be executed without any processing because CAAM driver is used
not only on i.MX and LS, but also PPC and Vybrid. We hope that
soc_device_match() could support to return -EPROBE_DEFER(or some other error
code, e.g. -ENODEV, but not NULL) in case of “no SoC device registered” to SoC
bus. We tried it and updated all the code that is using soc_device_match()
throughout the tree.

Alice Guo (3):
  drivers: soc: add support for soc_device_match returning -EPROBE_DEFER
  caam: add defer probe when the caam driver cannot identify SoC
  driver: update all the code that use soc_device_match

 drivers/base/soc.c                            |  5 +++++
 drivers/bus/ti-sysc.c                         |  2 +-
 drivers/clk/renesas/r8a7795-cpg-mssr.c        |  4 +++-
 drivers/clk/renesas/rcar-gen2-cpg.c           |  2 +-
 drivers/clk/renesas/rcar-gen3-cpg.c           |  2 +-
 drivers/crypto/caam/ctrl.c                    |  3 +++
 drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c       |  7 ++++++-
 drivers/dma/ti/k3-psil.c                      |  3 +++
 drivers/dma/ti/k3-udma.c                      |  2 +-
 drivers/gpu/drm/bridge/nwl-dsi.c              |  2 +-
 drivers/gpu/drm/meson/meson_drv.c             |  4 +++-
 drivers/gpu/drm/omapdrm/dss/dispc.c           |  2 +-
 drivers/gpu/drm/omapdrm/dss/dpi.c             |  4 +++-
 drivers/gpu/drm/omapdrm/dss/dsi.c             |  3 +++
 drivers/gpu/drm/omapdrm/dss/dss.c             |  3 +++
 drivers/gpu/drm/omapdrm/dss/hdmi4_core.c      |  3 +++
 drivers/gpu/drm/omapdrm/dss/venc.c            |  4 +++-
 drivers/gpu/drm/omapdrm/omap_drv.c            |  3 +++
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  4 +++-
 drivers/gpu/drm/rcar-du/rcar_lvds.c           |  2 +-
 drivers/gpu/drm/tidss/tidss_dispc.c           |  4 +++-
 drivers/iommu/ipmmu-vmsa.c                    |  7 +++++--
 drivers/media/platform/rcar-vin/rcar-core.c   |  2 +-
 drivers/media/platform/rcar-vin/rcar-csi2.c   |  2 +-
 drivers/media/platform/vsp1/vsp1_uif.c        |  4 +++-
 drivers/mmc/host/renesas_sdhi_core.c          |  2 +-
 drivers/mmc/host/renesas_sdhi_internal_dmac.c |  2 +-
 drivers/mmc/host/sdhci-of-esdhc.c             | 21 ++++++++++++++-----
 drivers/mmc/host/sdhci-omap.c                 |  2 +-
 drivers/mmc/host/sdhci_am654.c                |  2 +-
 drivers/net/ethernet/renesas/ravb_main.c      |  4 +++-
 drivers/net/ethernet/ti/am65-cpsw-nuss.c      |  2 +-
 drivers/net/ethernet/ti/cpsw.c                |  2 +-
 drivers/net/ethernet/ti/cpsw_new.c            |  2 +-
 drivers/phy/ti/phy-omap-usb2.c                |  4 +++-
 drivers/pinctrl/renesas/core.c                |  2 +-
 drivers/pinctrl/renesas/pfc-r8a7790.c         |  5 ++++-
 drivers/pinctrl/renesas/pfc-r8a7794.c         |  5 ++++-
 drivers/soc/fsl/dpio/dpio-driver.c            | 13 ++++++++----
 drivers/soc/renesas/r8a774c0-sysc.c           |  5 ++++-
 drivers/soc/renesas/r8a7795-sysc.c            |  2 +-
 drivers/soc/renesas/r8a77990-sysc.c           |  5 ++++-
 drivers/soc/ti/k3-ringacc.c                   |  2 +-
 drivers/staging/mt7621-pci/pci-mt7621.c       |  2 +-
 drivers/thermal/rcar_gen3_thermal.c           |  4 +++-
 drivers/thermal/ti-soc-thermal/ti-bandgap.c   | 10 +++++++--
 drivers/usb/gadget/udc/renesas_usb3.c         |  2 +-
 drivers/usb/host/ehci-platform.c              |  4 +++-
 drivers/usb/host/xhci-rcar.c                  |  2 +-
 drivers/watchdog/renesas_wdt.c                |  2 +-
 50 files changed, 139 insertions(+), 52 deletions(-)

-- 
2.17.1

[RFC v1 PATCH 1/3] drivers: soc: add support for soc_device_match returning -EPROBE_DEFER

[Alice Guo (OSS)]

From: Alice Guo <alice.guo@nxp.com>

In i.MX8M boards, the registration of SoC device is later than caam
driver which needs it. Caam driver needs soc_device_match to provide
-EPROBE_DEFER when no SoC device is registered and no
early_soc_dev_attr.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
---
 drivers/base/soc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/base/soc.c b/drivers/base/soc.c
index 0af5363a582c..12a22f9cf5c8 100644
--- a/drivers/base/soc.c
+++ b/drivers/base/soc.c
@@ -110,6 +110,7 @@ static void soc_release(struct device *dev)
 }
 
 static struct soc_device_attribute *early_soc_dev_attr;
+static bool soc_dev_attr_init_done = false;
 
 struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
 {
@@ -157,6 +158,7 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
 		return ERR_PTR(ret);
 	}
 
+	soc_dev_attr_init_done = true;
 	return soc_dev;
 
 out3:
@@ -246,6 +248,9 @@ const struct soc_device_attribute *soc_device_match(
 	if (!matches)
 		return NULL;
 
+	if (!soc_dev_attr_init_done && !early_soc_dev_attr)
+		return ERR_PTR(-EPROBE_DEFER);
+
 	while (!ret) {
 		if (!(matches->machine || matches->family ||
 		      matches->revision || matches->soc_id))
-- 
2.17.1

Re: [RFC v1 PATCH 1/3] drivers: soc: add support for soc_device_match returning -EPROBE_DEFER

[Dominique MARTINET]

First comment overall for the whole serie:
Since it is the solution I had suggested when I reported the problem[1]
I have no qualm on the approach, comments for individual patches
follow.

[1] http://lore.kernel.org/r/YGGZJjAxA1IO+/VU@atmark-techno.com


Alice Guo (OSS) wrote on Mon, Apr 19, 2021 at 12:27:20PM +0800:
> From: Alice Guo <alice.guo@nxp.com>
> 
> In i.MX8M boards, the registration of SoC device is later than caam
> driver which needs it. Caam driver needs soc_device_match to provide
> -EPROBE_DEFER when no SoC device is registered and no
> early_soc_dev_attr.

This patch should be last in the set: you can't have soc_device_match
return an error before its callers handle it.

> Signed-off-by: Alice Guo <alice.guo@nxp.com>

As the one who reported the problem I would have been appreciated being
at least added to Ccs... I only happened to notice you posted this by
chance.

There is also not a single Fixes tag -- I believe this commit should
have Fixes: 7d981405d0fd ("soc: imx8m: change to use platform driver")
but I'm not sure how such tags should be handled in case of multiple
patches fixing something.

-- 
Dominique

RE: [RFC v1 PATCH 1/3] drivers: soc: add support for soc_device_match returning -EPROBE_DEFER

[Alice Guo (OSS)]

> -----Original Message-----
> From: Dominique MARTINET <dominique.martinet@atmark-techno.com>
> Sent: 2021年4月19日 12:49
> To: Alice Guo (OSS) <alice.guo@oss.nxp.com>
> Cc: gregkh@linuxfoundation.org; rafael@kernel.org; Horia Geanta
> <horia.geanta@nxp.com>; Aymen Sghaier <aymen.sghaier@nxp.com>;
> herbert@gondor.apana.org.au; davem@davemloft.net; tony@atomide.com;
> geert+renesas@glider.be; mturquette@baylibre.com; sboyd@kernel.org;
> vkoul@kernel.org; peter.ujfalusi@gmail.com; a.hajda@samsung.com;
> narmstrong@baylibre.com; robert.foss@linaro.org; airlied@linux.ie;
> daniel@ffwll.ch; khilman@baylibre.com; tomba@kernel.org; jyri.sarha@iki.fi;
> joro@8bytes.org; will@kernel.org; mchehab@kernel.org;
> ulf.hansson@linaro.org; adrian.hunter@intel.com; kishon@ti.com;
> kuba@kernel.org; linus.walleij@linaro.org; Roy Pledge <roy.pledge@nxp.com>;
> Leo Li <leoyang.li@nxp.com>; ssantosh@kernel.org; matthias.bgg@gmail.com;
> edubezval@gmail.com; j-keerthy@ti.com; balbi@kernel.org;
> linux@prisktech.co.nz; stern@rowland.harvard.edu; wim@linux-watchdog.org;
> linux@roeck-us.net; linux-kernel@vger.kernel.org; linux-crypto@vger.kernel.org;
> linux-omap@vger.kernel.org; linux-renesas-soc@vger.kernel.org;
> linux-clk@vger.kernel.org; dmaengine@vger.kernel.org;
> dri-devel@lists.freedesktop.org; linux-amlogic@lists.infradead.org;
> linux-arm-kernel@lists.infradead.org; iommu@lists.linux-foundation.org;
> linux-media@vger.kernel.org; linux-mmc@vger.kernel.org;
> netdev@vger.kernel.org; linux-phy@lists.infradead.org;
> linux-gpio@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> linux-staging@lists.linux.dev; linux-mediatek@lists.infradead.org;
> linux-pm@vger.kernel.org; linux-usb@vger.kernel.org;
> linux-watchdog@vger.kernel.org
> Subject: Re: [RFC v1 PATCH 1/3] drivers: soc: add support for soc_device_match
> returning -EPROBE_DEFER
> 
> First comment overall for the whole serie:
> Since it is the solution I had suggested when I reported the problem[1] I have no
> qualm on the approach, comments for individual patches follow.
> 
> [1] http://lore.kernel.org/r/YGGZJjAxA1IO+/VU@atmark-techno.com
> 
> 
> Alice Guo (OSS) wrote on Mon, Apr 19, 2021 at 12:27:20PM +0800:
> > From: Alice Guo <alice.guo@nxp.com>
> >
> > In i.MX8M boards, the registration of SoC device is later than caam
> > driver which needs it. Caam driver needs soc_device_match to provide
> > -EPROBE_DEFER when no SoC device is registered and no
> > early_soc_dev_attr.
> 
> This patch should be last in the set: you can't have soc_device_match return an
> error before its callers handle it.
> 
> > Signed-off-by: Alice Guo <alice.guo@nxp.com>
> 
> As the one who reported the problem I would have been appreciated being at
> least added to Ccs... I only happened to notice you posted this by chance.

Sorry. I will Cc you next time.

> There is also not a single Fixes tag -- I believe this commit should have Fixes:
> 7d981405d0fd ("soc: imx8m: change to use platform driver") but I'm not sure
> how such tags should be handled in case of multiple patches fixing something.

I only mentioned "soc: imx8m: change to use platform driver" in cover letter.
If it is acceptable to make such a modification, I will send non-RFC and add Fixes tag.

Best Regards,
Alice

> --
> Dominique

Re: [RFC v1 PATCH 1/3] drivers: soc: add support for soc_device_match returning -EPROBE_DEFER

[Geert Uytterhoeven]

Hi Alice,

CC Arnd (soc_device_match() author)

On Mon, Apr 19, 2021 at 6:28 AM Alice Guo (OSS) <alice.guo@oss.nxp.com> wrote:
> From: Alice Guo <alice.guo@nxp.com>
>
> In i.MX8M boards, the registration of SoC device is later than caam
> driver which needs it. Caam driver needs soc_device_match to provide
> -EPROBE_DEFER when no SoC device is registered and no
> early_soc_dev_attr.

I'm wondering if this is really a good idea: soc_device_match() is a
last-resort low-level check, and IMHO should be made available early on,
so there is no need for -EPROBE_DEFER.

>
> Signed-off-by: Alice Guo <alice.guo@nxp.com>

Thanks for your patch!

> --- a/drivers/base/soc.c
> +++ b/drivers/base/soc.c
> @@ -110,6 +110,7 @@ static void soc_release(struct device *dev)
>  }
>
>  static struct soc_device_attribute *early_soc_dev_attr;
> +static bool soc_dev_attr_init_done = false;

Do you need this variable?

>
>  struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
>  {
> @@ -157,6 +158,7 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
>                 return ERR_PTR(ret);
>         }
>
> +       soc_dev_attr_init_done = true;
>         return soc_dev;
>
>  out3:
> @@ -246,6 +248,9 @@ const struct soc_device_attribute *soc_device_match(
>         if (!matches)
>                 return NULL;
>
> +       if (!soc_dev_attr_init_done && !early_soc_dev_attr)

if (!soc_bus_type.p && !early_soc_dev_attr)

> +               return ERR_PTR(-EPROBE_DEFER);
> +
>         while (!ret) {
>                 if (!(matches->machine || matches->family ||
>                       matches->revision || matches->soc_id))

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [RFC v1 PATCH 1/3] drivers: soc: add support for soc_device_match returning -EPROBE_DEFER

[Dan Carpenter]

On Mon, Apr 19, 2021 at 10:20:13AM +0200, Geert Uytterhoeven wrote:
> Hi Alice,
> 
> CC Arnd (soc_device_match() author)
> 
> On Mon, Apr 19, 2021 at 6:28 AM Alice Guo (OSS) <alice.guo@oss.nxp.com> wrote:
> > From: Alice Guo <alice.guo@nxp.com>
> >
> > In i.MX8M boards, the registration of SoC device is later than caam
> > driver which needs it. Caam driver needs soc_device_match to provide
> > -EPROBE_DEFER when no SoC device is registered and no
> > early_soc_dev_attr.
> 
> I'm wondering if this is really a good idea: soc_device_match() is a
> last-resort low-level check, and IMHO should be made available early on,
> so there is no need for -EPROBE_DEFER.
> 
> >
> > Signed-off-by: Alice Guo <alice.guo@nxp.com>
> 
> Thanks for your patch!
> 
> > --- a/drivers/base/soc.c
> > +++ b/drivers/base/soc.c
> > @@ -110,6 +110,7 @@ static void soc_release(struct device *dev)
> >  }
> >
> >  static struct soc_device_attribute *early_soc_dev_attr;
> > +static bool soc_dev_attr_init_done = false;
> 
> Do you need this variable?
> 
> >
> >  struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
> >  {
> > @@ -157,6 +158,7 @@ struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr
> >                 return ERR_PTR(ret);
> >         }
> >
> > +       soc_dev_attr_init_done = true;
> >         return soc_dev;
> >
> >  out3:
> > @@ -246,6 +248,9 @@ const struct soc_device_attribute *soc_device_match(
> >         if (!matches)
> >                 return NULL;
> >
> > +       if (!soc_dev_attr_init_done && !early_soc_dev_attr)
> 
> if (!soc_bus_type.p && !early_soc_dev_attr)

There is one place checking this already.  We could wrap it in a helper
function:

static bool device_init_done(void)
{
	return soc_bus_type.p ? true : false;
}

regards,
dan carpenter

[RFC v1 PATCH 2/3] caam: add defer probe when the caam driver cannot identify SoC

[Alice Guo (OSS)]

From: Alice Guo <alice.guo@nxp.com>

When imx8_soc_info_driver uses module_platform_driver() to regitser
itself, the caam driver cannot identify the SoC in the machine because
the SoC driver is probed later, so that add return -EPROBE_DEFER.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
---
 drivers/crypto/caam/ctrl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index ca0361b2dbb0..d08f8cc4131f 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -635,6 +635,9 @@ static int caam_probe(struct platform_device *pdev)
 	nprop = pdev->dev.of_node;
 
 	imx_soc_match = soc_device_match(caam_imx_soc_table);
+	if (IS_ERR(imx_soc_match))
+		return PTR_ERR(imx_soc_match);
+
 	caam_imx = (bool)imx_soc_match;
 
 	if (imx_soc_match) {
-- 
2.17.1

[RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Alice Guo (OSS)]

From: Alice Guo <alice.guo@nxp.com>

Update all the code that use soc_device_match because add support for
soc_device_match returning -EPROBE_DEFER.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
---
 drivers/bus/ti-sysc.c                         |  2 +-
 drivers/clk/renesas/r8a7795-cpg-mssr.c        |  4 +++-
 drivers/clk/renesas/rcar-gen2-cpg.c           |  2 +-
 drivers/clk/renesas/rcar-gen3-cpg.c           |  2 +-
 drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c       |  7 ++++++-
 drivers/dma/ti/k3-psil.c                      |  3 +++
 drivers/dma/ti/k3-udma.c                      |  2 +-
 drivers/gpu/drm/bridge/nwl-dsi.c              |  2 +-
 drivers/gpu/drm/meson/meson_drv.c             |  4 +++-
 drivers/gpu/drm/omapdrm/dss/dispc.c           |  2 +-
 drivers/gpu/drm/omapdrm/dss/dpi.c             |  4 +++-
 drivers/gpu/drm/omapdrm/dss/dsi.c             |  3 +++
 drivers/gpu/drm/omapdrm/dss/dss.c             |  3 +++
 drivers/gpu/drm/omapdrm/dss/hdmi4_core.c      |  3 +++
 drivers/gpu/drm/omapdrm/dss/venc.c            |  4 +++-
 drivers/gpu/drm/omapdrm/omap_drv.c            |  3 +++
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  4 +++-
 drivers/gpu/drm/rcar-du/rcar_lvds.c           |  2 +-
 drivers/gpu/drm/tidss/tidss_dispc.c           |  4 +++-
 drivers/iommu/ipmmu-vmsa.c                    |  7 +++++--
 drivers/media/platform/rcar-vin/rcar-core.c   |  2 +-
 drivers/media/platform/rcar-vin/rcar-csi2.c   |  2 +-
 drivers/media/platform/vsp1/vsp1_uif.c        |  4 +++-
 drivers/mmc/host/renesas_sdhi_core.c          |  2 +-
 drivers/mmc/host/renesas_sdhi_internal_dmac.c |  2 +-
 drivers/mmc/host/sdhci-of-esdhc.c             | 21 ++++++++++++++-----
 drivers/mmc/host/sdhci-omap.c                 |  2 +-
 drivers/mmc/host/sdhci_am654.c                |  2 +-
 drivers/net/ethernet/renesas/ravb_main.c      |  4 +++-
 drivers/net/ethernet/ti/am65-cpsw-nuss.c      |  2 +-
 drivers/net/ethernet/ti/cpsw.c                |  2 +-
 drivers/net/ethernet/ti/cpsw_new.c            |  2 +-
 drivers/phy/ti/phy-omap-usb2.c                |  4 +++-
 drivers/pinctrl/renesas/core.c                |  2 +-
 drivers/pinctrl/renesas/pfc-r8a7790.c         |  5 ++++-
 drivers/pinctrl/renesas/pfc-r8a7794.c         |  5 ++++-
 drivers/soc/fsl/dpio/dpio-driver.c            | 13 ++++++++----
 drivers/soc/renesas/r8a774c0-sysc.c           |  5 ++++-
 drivers/soc/renesas/r8a7795-sysc.c            |  2 +-
 drivers/soc/renesas/r8a77990-sysc.c           |  5 ++++-
 drivers/soc/ti/k3-ringacc.c                   |  2 +-
 drivers/staging/mt7621-pci/pci-mt7621.c       |  2 +-
 drivers/thermal/rcar_gen3_thermal.c           |  4 +++-
 drivers/thermal/ti-soc-thermal/ti-bandgap.c   | 10 +++++++--
 drivers/usb/gadget/udc/renesas_usb3.c         |  2 +-
 drivers/usb/host/ehci-platform.c              |  4 +++-
 drivers/usb/host/xhci-rcar.c                  |  2 +-
 drivers/watchdog/renesas_wdt.c                |  2 +-
 48 files changed, 131 insertions(+), 52 deletions(-)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 5fae60f8c135..00c59aa217c1 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -2909,7 +2909,7 @@ static int sysc_init_soc(struct sysc *ddata)
 	}
 
 	match = soc_device_match(sysc_soc_feat_match);
-	if (!match)
+	if (!match || IS_ERR(match))
 		return 0;
 
 	if (match->data)
diff --git a/drivers/clk/renesas/r8a7795-cpg-mssr.c b/drivers/clk/renesas/r8a7795-cpg-mssr.c
index c32d2c678046..90a18336a4c3 100644
--- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
+++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
@@ -439,6 +439,7 @@ static const unsigned int r8a7795es2_mod_nullify[] __initconst = {
 
 static int __init r8a7795_cpg_mssr_init(struct device *dev)
 {
+	const struct soc_device_attribute *match;
 	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
 	u32 cpg_mode;
 	int error;
@@ -453,7 +454,8 @@ static int __init r8a7795_cpg_mssr_init(struct device *dev)
 		return -EINVAL;
 	}
 
-	if (soc_device_match(r8a7795es1)) {
+	match = soc_device_match(r8a7795es1);
+	if (!IS_ERR(match) && match) {
 		cpg_core_nullify_range(r8a7795_core_clks,
 				       ARRAY_SIZE(r8a7795_core_clks),
 				       R8A7795_CLK_S0D2, R8A7795_CLK_S0D12);
diff --git a/drivers/clk/renesas/rcar-gen2-cpg.c b/drivers/clk/renesas/rcar-gen2-cpg.c
index edae874fa2b6..946f82634d23 100644
--- a/drivers/clk/renesas/rcar-gen2-cpg.c
+++ b/drivers/clk/renesas/rcar-gen2-cpg.c
@@ -383,7 +383,7 @@ int __init rcar_gen2_cpg_init(const struct rcar_gen2_cpg_pll_config *config,
 	cpg_pll0_div = pll0_div;
 	cpg_mode = mode;
 	attr = soc_device_match(cpg_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		cpg_quirks = (uintptr_t)attr->data;
 	pr_debug("%s: mode = 0x%x quirks = 0x%x\n", __func__, mode, cpg_quirks);
 
diff --git a/drivers/clk/renesas/rcar-gen3-cpg.c b/drivers/clk/renesas/rcar-gen3-cpg.c
index caa0f9414e45..e5c7854188cd 100644
--- a/drivers/clk/renesas/rcar-gen3-cpg.c
+++ b/drivers/clk/renesas/rcar-gen3-cpg.c
@@ -499,7 +499,7 @@ int __init rcar_gen3_cpg_init(const struct rcar_gen3_cpg_pll_config *config,
 	cpg_clk_extalr = clk_extalr;
 	cpg_mode = mode;
 	attr = soc_device_match(cpg_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		cpg_quirks = (uintptr_t)attr->data;
 	pr_debug("%s: mode = 0x%x quirks = 0x%x\n", __func__, mode, cpg_quirks);
 
diff --git a/drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c b/drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c
index 4ec909e0b810..7c83ae86ced4 100644
--- a/drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c
+++ b/drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c
@@ -651,6 +651,7 @@ static int dpaa2_dpdmai_init_channels(struct dpaa2_qdma_engine *dpaa2_qdma)
 
 static int dpaa2_qdma_probe(struct fsl_mc_device *dpdmai_dev)
 {
+	const struct soc_device_attribute *match;
 	struct device *dev = &dpdmai_dev->dev;
 	struct dpaa2_qdma_engine *dpaa2_qdma;
 	struct dpaa2_qdma_priv *priv;
@@ -718,7 +719,11 @@ static int dpaa2_qdma_probe(struct fsl_mc_device *dpdmai_dev)
 
 	dpaa2_dpdmai_init_channels(dpaa2_qdma);
 
-	if (soc_device_match(soc_fixup_tuning))
+	match = soc_device_match(soc_fixup_tuning);
+	if (IS_ERR(match))
+		return PTR_ERR(match);
+
+	if (match)
 		dpaa2_qdma->qdma_wrtype_fixup = true;
 	else
 		dpaa2_qdma->qdma_wrtype_fixup = false;
diff --git a/drivers/dma/ti/k3-psil.c b/drivers/dma/ti/k3-psil.c
index 13ce7367d870..ae56441e5184 100644
--- a/drivers/dma/ti/k3-psil.c
+++ b/drivers/dma/ti/k3-psil.c
@@ -33,6 +33,9 @@ struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
 		const struct soc_device_attribute *soc;
 
 		soc = soc_device_match(k3_soc_devices);
+		if (IS_ERR(soc))
+			return PTR_ERR(soc);
+
 		if (soc) {
 			soc_ep_map = soc->data;
 		} else {
diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 96ad21869ba7..50a4c8f0993d 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -5188,7 +5188,7 @@ static int udma_probe(struct platform_device *pdev)
 	ud->match_data = match->data;
 
 	soc = soc_device_match(k3_soc_devices);
-	if (!soc) {
+	if (!IS_ERR(soc) && !soc) {
 		dev_err(dev, "No compatible SoC found\n");
 		return -ENODEV;
 	}
diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 66b67402f1ac..80fe971e359d 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -1158,7 +1158,7 @@ static int nwl_dsi_probe(struct platform_device *pdev)
 	}
 
 	attr = soc_device_match(nwl_dsi_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		dsi->quirks = (uintptr_t)attr->data;
 
 	dsi->bridge.driver_private = dsi;
diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
index 453d8b4c5763..d409c9958f18 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -195,6 +195,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 {
 	struct platform_device *pdev = to_platform_device(dev);
 	const struct meson_drm_match_data *match;
+	const struct soc_device_attribute *attr;
 	struct meson_drm *priv;
 	struct drm_device *drm;
 	struct resource *res;
@@ -291,7 +292,8 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
 
 	/* Assign limits per soc revision/package */
 	for (i = 0 ; i < ARRAY_SIZE(meson_drm_soc_attrs) ; ++i) {
-		if (soc_device_match(meson_drm_soc_attrs[i].attrs)) {
+		attr = soc_device_match(meson_drm_soc_attrs[i].attrs);
+		if (!IS_ERR(attr) && attr) {
 			priv->limits = &meson_drm_soc_attrs[i].limits;
 			break;
 		}
diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
index 5619420cc2cc..53f402d72fc4 100644
--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -4741,7 +4741,7 @@ static int dispc_bind(struct device *dev, struct device *master, void *data)
 	 * string, use SoC device matching.
 	 */
 	soc = soc_device_match(dispc_soc_devices);
-	if (soc)
+	if (!IS_ERR(soc) && soc)
 		dispc->feat = soc->data;
 	else
 		dispc->feat = of_match_device(dispc_of_match, &pdev->dev)->data;
diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index 030f997eccd0..57b1c62dcdf2 100644
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -677,12 +677,14 @@ static const struct soc_device_attribute dpi_soc_devices[] = {
 static int dpi_init_regulator(struct dpi_data *dpi)
 {
 	struct regulator *vdds_dsi;
+	struct soc_device_attribute *soc;
 
 	/*
 	 * The DPI uses the DSI VDDS on OMAP34xx, OMAP35xx, OMAP36xx, AM37xx and
 	 * DM37xx only.
 	 */
-	if (!soc_device_match(dpi_soc_devices))
+	soc = soc_device_match(dpi_soc_devices);
+	if (!IS_ERR(soc) && !soc)
 		return 0;
 
 	vdds_dsi = devm_regulator_get(&dpi->pdev->dev, "vdds_dsi");
diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 5f1722b040f4..cbef6fb85d1d 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -4952,6 +4952,9 @@ static int dsi_probe(struct platform_device *pdev)
 	}
 
 	soc = soc_device_match(dsi_soc_devices);
+	if (IS_ERR(soc))
+		return PTR_ERR(soc);
+
 	if (soc)
 		dsi->data = soc->data;
 	else
diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c
index d6a5862b4dbf..1f88d25d178b 100644
--- a/drivers/gpu/drm/omapdrm/dss/dss.c
+++ b/drivers/gpu/drm/omapdrm/dss/dss.c
@@ -1446,6 +1446,9 @@ static int dss_probe(struct platform_device *pdev)
 	 * string, use SoC device matching.
 	 */
 	soc = soc_device_match(dss_soc_devices);
+	if (IS_ERR(soc))
+		return PTR_ERR(soc);
+
 	if (soc)
 		dss->feat = soc->data;
 	else
diff --git a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
index 35faa7f028c4..53a09cfd4deb 100644
--- a/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
+++ b/drivers/gpu/drm/omapdrm/dss/hdmi4_core.c
@@ -874,6 +874,9 @@ int hdmi4_core_init(struct platform_device *pdev, struct hdmi_core_data *core)
 	const struct soc_device_attribute *soc;
 
 	soc = soc_device_match(hdmi4_soc_devices);
+	if (IS_ERR(soc))
+		return PTR_ERR(soc);
+
 	if (!soc)
 		return -ENODEV;
 
diff --git a/drivers/gpu/drm/omapdrm/dss/venc.c b/drivers/gpu/drm/omapdrm/dss/venc.c
index e522c17955d0..df6fa3977481 100644
--- a/drivers/gpu/drm/omapdrm/dss/venc.c
+++ b/drivers/gpu/drm/omapdrm/dss/venc.c
@@ -805,6 +805,7 @@ static const struct soc_device_attribute venc_soc_devices[] = {
 
 static int venc_probe(struct platform_device *pdev)
 {
+	const struct soc_device_attribute *match;
 	struct venc_device *venc;
 	struct resource *venc_mem;
 	int r;
@@ -818,7 +819,8 @@ static int venc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, venc);
 
 	/* The OMAP34xx, OMAP35xx and AM35xx VENC require the TV DAC clock. */
-	if (soc_device_match(venc_soc_devices))
+	match = soc_device_match(venc_soc_devices);
+	if (!IS_ERR(match) && match)
 		venc->requires_tv_dac_clk = true;
 
 	venc->config = &venc_config_pal_trm;
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 8632139e0f01..8542998f5e9e 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -576,6 +576,9 @@ static int omapdrm_init(struct omap_drm_private *priv, struct device *dev)
 	priv->dss->mgr_ops_priv = priv;
 
 	soc = soc_device_match(omapdrm_soc_devices);
+	if (IS_ERR(soc))
+		return PTR_ERR(soc);
+
 	priv->omaprev = soc ? (unsigned int)soc->data : 0;
 	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
 
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index ea7e39d03545..06f5fd518326 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -215,6 +215,7 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 	const struct drm_display_mode *mode = &rcrtc->crtc.state->adjusted_mode;
 	struct rcar_du_device *rcdu = rcrtc->dev;
 	unsigned long mode_clock = mode->clock * 1000;
+	const struct soc_device_attribute *match;
 	u32 dsmr;
 	u32 escr;
 
@@ -238,7 +239,8 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 		 * no post-divider when a display PLL is present (as shown by
 		 * the workaround breaking HDMI output on M3-W during testing).
 		 */
-		if (soc_device_match(rcar_du_r8a7795_es1)) {
+		match = soc_device_match(rcar_du_r8a7795_es1);
+		if (!IS_ERR(match) && match) {
 			target *= 2;
 			div = 1;
 		}
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 70dbbe44bb23..273c812a04e0 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -912,7 +912,7 @@ static int rcar_lvds_probe(struct platform_device *pdev)
 	lvds->info = of_device_get_match_data(&pdev->dev);
 
 	attr = soc_device_match(lvds_quirk_matches);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		lvds->info = attr->data;
 
 	ret = rcar_lvds_parse_dt(lvds);
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c
index 60b92df615aa..8f083604e04f 100644
--- a/drivers/gpu/drm/tidss/tidss_dispc.c
+++ b/drivers/gpu/drm/tidss/tidss_dispc.c
@@ -2643,8 +2643,10 @@ static void dispc_init_errata(struct dispc_device *dispc)
 		{ .family = "AM65X", .revision = "SR1.0" },
 		{ /* sentinel */ }
 	};
+	const struct soc_device_attribute *match;
 
-	if (soc_device_match(am65x_sr10_soc_devices)) {
+	match = soc_device_match(am65x_sr10_soc_devices);
+	if (!IS_ERR(match) && match) {
 		dispc->errata.i2000 = true;
 		dev_info(dispc->dev, "WA for erratum i2000: YUV formats disabled\n");
 	}
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index eaaec0a55cc6..13a06b613379 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -757,17 +757,20 @@ static const char * const devices_allowlist[] = {
 
 static bool ipmmu_device_is_allowed(struct device *dev)
 {
+	const struct soc_device_attribute *match1, *match2;
 	unsigned int i;
 
 	/*
 	 * R-Car Gen3 and RZ/G2 use the allow list to opt-in devices.
 	 * For Other SoCs, this returns true anyway.
 	 */
-	if (!soc_device_match(soc_needs_opt_in))
+	match1 = soc_device_match(soc_needs_opt_in);
+	if (!IS_ERR(match1) && !match1)
 		return true;
 
 	/* Check whether this SoC can use the IPMMU correctly or not */
-	if (soc_device_match(soc_denylist))
+	match2 = soc_device_match(soc_denylist);
+	if (!IS_ERR(match2) && !match2)
 		return false;
 
 	/* Check whether this device can work with the IPMMU */
diff --git a/drivers/media/platform/rcar-vin/rcar-core.c b/drivers/media/platform/rcar-vin/rcar-core.c
index cb3025992817..37afc4b169c1 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -1413,7 +1413,7 @@ static int rcar_vin_probe(struct platform_device *pdev)
 	 * uses different routing than r8a7795 ES2.0.
 	 */
 	attr = soc_device_match(r8a7795es1);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		vin->info = attr->data;
 
 	vin->base = devm_platform_ioremap_resource(pdev, 0);
diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index e06cd512aba2..b83200e8e30d 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -1214,7 +1214,7 @@ static int rcsi2_probe(struct platform_device *pdev)
 	 * share the same compatible string.
 	 */
 	attr = soc_device_match(r8a7795);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		priv->info = attr->data;
 
 	priv->dev = &pdev->dev;
diff --git a/drivers/media/platform/vsp1/vsp1_uif.c b/drivers/media/platform/vsp1/vsp1_uif.c
index 467d1072577b..e5c5b4f50dea 100644
--- a/drivers/media/platform/vsp1/vsp1_uif.c
+++ b/drivers/media/platform/vsp1/vsp1_uif.c
@@ -240,6 +240,7 @@ static const struct soc_device_attribute vsp1_r8a7796[] = {
 struct vsp1_uif *vsp1_uif_create(struct vsp1_device *vsp1, unsigned int index)
 {
 	struct vsp1_uif *uif;
+	const struct soc_device_attribute *attr;
 	char name[6];
 	int ret;
 
@@ -247,7 +248,8 @@ struct vsp1_uif *vsp1_uif_create(struct vsp1_device *vsp1, unsigned int index)
 	if (!uif)
 		return ERR_PTR(-ENOMEM);
 
-	if (soc_device_match(vsp1_r8a7796))
+	attr = soc_device_match(vsp1_r8a7796);
+	if (!IS_ERR(attr) && attr)
 		uif->m3w_quirk = true;
 
 	uif->entity.ops = &uif_entity_ops;
diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
index 635bf31a6735..71986a8bf50e 100644
--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -964,7 +964,7 @@ int renesas_sdhi_probe(struct platform_device *pdev,
 	of_data = of_device_get_match_data(&pdev->dev);
 
 	attr = soc_device_match(sdhi_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		quirks = attr->data;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
index e8f4863d8f1a..946f57b3cc48 100644
--- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c
+++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c
@@ -408,7 +408,7 @@ static int renesas_sdhi_internal_dmac_probe(struct platform_device *pdev)
 	const struct soc_device_attribute *soc = soc_device_match(soc_dma_quirks);
 	struct device *dev = &pdev->dev;
 
-	if (soc)
+	if (!IS_ERR(soc) && soc)
 		global_flags |= (unsigned long)soc->data;
 
 	/* value is max of SD_SECCNT. Confirmed by HW engineers */
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index ab5ab969f711..4259553451da 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -1336,6 +1336,7 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
 	struct sdhci_esdhc *esdhc;
 	struct device_node *np;
 	struct clk *clk;
+	const struct soc_device_attribute *match1, *match2, *match3;
 	u32 val;
 	u16 host_ver;
 
@@ -1346,17 +1347,20 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
 	esdhc->vendor_ver = (host_ver & SDHCI_VENDOR_VER_MASK) >>
 			     SDHCI_VENDOR_VER_SHIFT;
 	esdhc->spec_ver = host_ver & SDHCI_SPEC_VER_MASK;
-	if (soc_device_match(soc_incorrect_hostver))
+	match1 = soc_device_match(soc_incorrect_hostver);
+	if (!IS_ERR(match1) && match1)
 		esdhc->quirk_incorrect_hostver = true;
 	else
 		esdhc->quirk_incorrect_hostver = false;
 
-	if (soc_device_match(soc_fixup_sdhc_clkdivs))
+	match2 = soc_device_match(soc_fixup_sdhc_clkdivs);
+	if (!IS_ERR(match2) && match2)
 		esdhc->quirk_limited_clk_division = true;
 	else
 		esdhc->quirk_limited_clk_division = false;
 
-	if (soc_device_match(soc_unreliable_pulse_detection))
+	match3 = soc_device_match(soc_unreliable_pulse_detection);
+	if (!IS_ERR(match3) && match3)
 		esdhc->quirk_unreliable_pulse_detection = true;
 	else
 		esdhc->quirk_unreliable_pulse_detection = false;
@@ -1417,6 +1421,7 @@ static int sdhci_esdhc_probe(struct platform_device *pdev)
 	struct device_node *np;
 	struct sdhci_pltfm_host *pltfm_host;
 	struct sdhci_esdhc *esdhc;
+	const struct soc_device_attribute *match1, *match2;
 	int ret;
 
 	np = pdev->dev.of_node;
@@ -1443,12 +1448,18 @@ static int sdhci_esdhc_probe(struct platform_device *pdev)
 
 	pltfm_host = sdhci_priv(host);
 	esdhc = sdhci_pltfm_priv(pltfm_host);
-	if (soc_device_match(soc_tuning_erratum_type1))
+	match1 = soc_device_match(soc_tuning_erratum_type1);
+	if (IS_ERR(match1))
+		return PTR_ERR(match1);
+	if (match1)
 		esdhc->quirk_tuning_erratum_type1 = true;
 	else
 		esdhc->quirk_tuning_erratum_type1 = false;
 
-	if (soc_device_match(soc_tuning_erratum_type2))
+	match2 = soc_device_match(soc_tuning_erratum_type2);
+	if (IS_ERR(match2))
+		return PTR_ERR(match2);
+	if (match2)
 		esdhc->quirk_tuning_erratum_type2 = true;
 	else
 		esdhc->quirk_tuning_erratum_type2 = false;
diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
index 7893fd3599b6..5a6f2b22eb42 100644
--- a/drivers/mmc/host/sdhci-omap.c
+++ b/drivers/mmc/host/sdhci-omap.c
@@ -1132,7 +1132,7 @@ static int sdhci_omap_probe(struct platform_device *pdev)
 		goto err_pltfm_free;
 
 	soc = soc_device_match(sdhci_omap_soc_devices);
-	if (soc) {
+	if (!IS_ERR(soc) && soc) {
 		omap_host->version = "rev11";
 		if (!strcmp(dev_name(dev), "4809c000.mmc"))
 			mmc->f_max = 96000000;
diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index 1fad6e442688..c0d1a0eab939 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -787,7 +787,7 @@ static int sdhci_am654_probe(struct platform_device *pdev)
 
 	/* Update drvdata based on SoC revision */
 	soc = soc_device_match(sdhci_am654_devices);
-	if (soc && soc->data)
+	if (!IS_ERR(soc) && soc && soc->data)
 		drvdata = soc->data;
 
 	host = sdhci_pltfm_init(pdev, drvdata->pdata, sizeof(*sdhci_am654));
diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
index 8c84c40ab9a0..f9e1cafe9b1a 100644
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1016,6 +1016,7 @@ static int ravb_phy_init(struct net_device *ndev)
 	struct ravb_private *priv = netdev_priv(ndev);
 	struct phy_device *phydev;
 	struct device_node *pn;
+	const struct soc_device_attribute *soc;
 	phy_interface_t iface;
 	int err;
 
@@ -1049,7 +1050,8 @@ static int ravb_phy_init(struct net_device *ndev)
 	/* This driver only support 10/100Mbit speeds on R-Car H3 ES1.0
 	 * at this time.
 	 */
-	if (soc_device_match(r8a7795es10)) {
+	soc = soc_device_match(r8a7795es10);
+	if (!IS_ERR(soc) && soc) {
 		err = phy_set_max_speed(phydev, SPEED_100);
 		if (err) {
 			netdev_err(ndev, "failed to limit PHY to 100Mbit/s\n");
diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 6a67b026df0b..01c1e5b573fa 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -2596,7 +2596,7 @@ static void am65_cpsw_nuss_apply_socinfo(struct am65_cpsw_common *common)
 	const struct soc_device_attribute *soc;
 
 	soc = soc_device_match(am65_cpsw_socinfo);
-	if (soc && soc->data) {
+	if (!IS_ERR(soc) && soc && soc->data) {
 		const struct am65_cpsw_soc_pdata *socdata = soc->data;
 
 		/* disable quirks */
diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
index c0cd7de88316..12bb62ed0fe9 100644
--- a/drivers/net/ethernet/ti/cpsw.c
+++ b/drivers/net/ethernet/ti/cpsw.c
@@ -1579,7 +1579,7 @@ static int cpsw_probe(struct platform_device *pdev)
 		goto clean_dt_ret;
 
 	soc = soc_device_match(cpsw_soc_devices);
-	if (soc)
+	if (!IS_ERR(soc) && soc)
 		cpsw->quirk_irq = true;
 
 	data = &cpsw->data;
diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c
index 69b7a4e0220a..2b82a3e4a3cc 100644
--- a/drivers/net/ethernet/ti/cpsw_new.c
+++ b/drivers/net/ethernet/ti/cpsw_new.c
@@ -1925,7 +1925,7 @@ static int cpsw_probe(struct platform_device *pdev)
 		goto clean_dt_ret;
 
 	soc = soc_device_match(cpsw_soc_devices);
-	if (soc)
+	if (!IS_ERR(soc) && soc)
 		cpsw->quirk_irq = true;
 
 	cpsw->rx_packet_max = rx_packet_max;
diff --git a/drivers/phy/ti/phy-omap-usb2.c b/drivers/phy/ti/phy-omap-usb2.c
index ebceb1520ce8..d7346d0ea9ed 100644
--- a/drivers/phy/ti/phy-omap-usb2.c
+++ b/drivers/phy/ti/phy-omap-usb2.c
@@ -348,6 +348,7 @@ static void omap_usb2_init_errata(struct omap_usb *phy)
 		{ .family = "AM65X", .revision = "SR1.0" },
 		{ /* sentinel */ }
 	};
+	const struct soc_device_attribute *soc;
 
 	/*
 	 * Errata i2075: USB2PHY: USB2PHY Charger Detect is Enabled by
@@ -358,7 +359,8 @@ static void omap_usb2_init_errata(struct omap_usb *phy)
 	 * Disabling the USB2_PHY Charger Detect function will put D+
 	 * into the normal state.
 	 */
-	if (soc_device_match(am65x_sr10_soc_devices))
+	soc = soc_device_match(am65x_sr10_soc_devices);
+	if (!IS_ERR(soc) && soc)
 		phy->flags |= OMAP_USB2_DISABLE_CHRG_DET;
 }
 
diff --git a/drivers/pinctrl/renesas/core.c b/drivers/pinctrl/renesas/core.c
index 5ccc49b387f1..758444e0a620 100644
--- a/drivers/pinctrl/renesas/core.c
+++ b/drivers/pinctrl/renesas/core.c
@@ -1102,7 +1102,7 @@ static const void *sh_pfc_quirk_match(void)
 	};
 
 	match = soc_device_match(quirks);
-	if (match)
+	if (!IS_ERR(match) && match)
 		return match->data ?: ERR_PTR(-ENODEV);
 #endif /* CONFIG_PINCTRL_PFC_R8A77950 || CONFIG_PINCTRL_PFC_R8A77951 */
 
diff --git a/drivers/pinctrl/renesas/pfc-r8a7790.c b/drivers/pinctrl/renesas/pfc-r8a7790.c
index e9a64e0e2734..57044d338fd5 100644
--- a/drivers/pinctrl/renesas/pfc-r8a7790.c
+++ b/drivers/pinctrl/renesas/pfc-r8a7790.c
@@ -5999,8 +5999,11 @@ static const struct soc_device_attribute r8a7790_tdsel[] = {
 
 static int r8a7790_pinmux_soc_init(struct sh_pfc *pfc)
 {
+	const struct soc_device_attribute *match;
+
 	/* Initialize TDSEL on old revisions */
-	if (soc_device_match(r8a7790_tdsel))
+	match = soc_device_match(r8a7790_tdsel);
+	if (!IS_ERR(match) && match)
 		sh_pfc_write(pfc, 0xe6060088, 0x00155554);
 
 	return 0;
diff --git a/drivers/pinctrl/renesas/pfc-r8a7794.c b/drivers/pinctrl/renesas/pfc-r8a7794.c
index 34481b6c4328..fb9a714dec1d 100644
--- a/drivers/pinctrl/renesas/pfc-r8a7794.c
+++ b/drivers/pinctrl/renesas/pfc-r8a7794.c
@@ -5587,8 +5587,11 @@ static const struct soc_device_attribute r8a7794_tdsel[] = {
 
 static int r8a7794_pinmux_soc_init(struct sh_pfc *pfc)
 {
+	const struct soc_device_attribute *match;
+
 	/* Initialize TDSEL on old revisions */
-	if (soc_device_match(r8a7794_tdsel))
+	match = soc_device_match(r8a7794_tdsel);
+	if (!IS_ERR(match) && match)
 		sh_pfc_write(pfc, 0xe6060068, 0x55555500);
 
 	return 0;
diff --git a/drivers/soc/fsl/dpio/dpio-driver.c b/drivers/soc/fsl/dpio/dpio-driver.c
index 7f397b4ad878..01e3d1ca54df 100644
--- a/drivers/soc/fsl/dpio/dpio-driver.c
+++ b/drivers/soc/fsl/dpio/dpio-driver.c
@@ -55,14 +55,19 @@ static const struct soc_device_attribute lx2160a_soc[] = {
 
 static int dpaa2_dpio_get_cluster_sdest(struct fsl_mc_device *dpio_dev, int cpu)
 {
+	const struct soc_device_attribute *match1, *match2, *match3, *match4;
 	int cluster_base, cluster_size;
 
-	if (soc_device_match(ls1088a_soc)) {
+	match1 = soc_device_match(ls1088a_soc);
+	match2 = soc_device_match(ls2080a_soc);
+	match3 = soc_device_match(ls2088a_soc);
+	match4 = soc_device_match(lx2160a_soc);
+	if (!IS_ERR(match1) && match1) {
 		cluster_base = 2;
 		cluster_size = 4;
-	} else if (soc_device_match(ls2080a_soc) ||
-		   soc_device_match(ls2088a_soc) ||
-		   soc_device_match(lx2160a_soc)) {
+	} else if ((!IS_ERR(match2) && match2) ||
+		   (!IS_ERR(match3) && match3) ||
+		   (!IS_ERR(match4) && match4)) {
 		cluster_base = 0;
 		cluster_size = 2;
 	} else {
diff --git a/drivers/soc/renesas/r8a774c0-sysc.c b/drivers/soc/renesas/r8a774c0-sysc.c
index c1c216f7d073..6b0b092c1b45 100644
--- a/drivers/soc/renesas/r8a774c0-sysc.c
+++ b/drivers/soc/renesas/r8a774c0-sysc.c
@@ -36,7 +36,10 @@ static const struct soc_device_attribute r8a774c0[] __initconst = {
 
 static int __init r8a774c0_sysc_init(void)
 {
-	if (soc_device_match(r8a774c0)) {
+	const struct soc_device_attribute *match;
+
+	match = soc_device_match(r8a774c0);
+	if (!IS_ERR(match) && match) {
 		/* Fix incorrect 3DG hierarchy */
 		swap(r8a774c0_areas[6], r8a774c0_areas[7]);
 		r8a774c0_areas[6].parent = R8A774C0_PD_ALWAYS_ON;
diff --git a/drivers/soc/renesas/r8a7795-sysc.c b/drivers/soc/renesas/r8a7795-sysc.c
index 91074411b8cf..7d5dcfcb1d09 100644
--- a/drivers/soc/renesas/r8a7795-sysc.c
+++ b/drivers/soc/renesas/r8a7795-sysc.c
@@ -74,7 +74,7 @@ static int __init r8a7795_sysc_init(void)
 	u32 quirks = 0;
 
 	attr = soc_device_match(r8a7795_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		quirks = (uintptr_t)attr->data;
 
 	if (!(quirks & HAS_A2VC0))
diff --git a/drivers/soc/renesas/r8a77990-sysc.c b/drivers/soc/renesas/r8a77990-sysc.c
index 9f92737dc352..10353afe061d 100644
--- a/drivers/soc/renesas/r8a77990-sysc.c
+++ b/drivers/soc/renesas/r8a77990-sysc.c
@@ -36,7 +36,10 @@ static const struct soc_device_attribute r8a77990[] __initconst = {
 
 static int __init r8a77990_sysc_init(void)
 {
-	if (soc_device_match(r8a77990)) {
+	const struct soc_device_attribute *match;
+
+	match = soc_device_match(r8a77990);
+	if (!IS_ERR(match) && match) {
 		/* Fix incorrect 3DG hierarchy */
 		swap(r8a77990_areas[7], r8a77990_areas[8]);
 		r8a77990_areas[7].parent = R8A77990_PD_ALWAYS_ON;
diff --git a/drivers/soc/ti/k3-ringacc.c b/drivers/soc/ti/k3-ringacc.c
index 312ba0f98ad7..f4a08992e827 100644
--- a/drivers/soc/ti/k3-ringacc.c
+++ b/drivers/soc/ti/k3-ringacc.c
@@ -1368,7 +1368,7 @@ static int k3_ringacc_init(struct platform_device *pdev,
 		return ret;
 
 	soc = soc_device_match(k3_ringacc_socinfo);
-	if (soc && soc->data) {
+	if (!IS_ERR(soc) && soc && soc->data) {
 		const struct k3_ringacc_soc_data *soc_data = soc->data;
 
 		ringacc->dma_ring_reset_quirk = soc_data->dma_ring_reset_quirk;
diff --git a/drivers/staging/mt7621-pci/pci-mt7621.c b/drivers/staging/mt7621-pci/pci-mt7621.c
index 115250115f10..34ce3c8eb9fc 100644
--- a/drivers/staging/mt7621-pci/pci-mt7621.c
+++ b/drivers/staging/mt7621-pci/pci-mt7621.c
@@ -667,7 +667,7 @@ static int mt7621_pci_probe(struct platform_device *pdev)
 	INIT_LIST_HEAD(&pcie->ports);
 
 	attr = soc_device_match(mt7621_pci_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		pcie->resets_inverted = true;
 
 	err = mt7621_pcie_parse_dt(pcie);
diff --git a/drivers/thermal/rcar_gen3_thermal.c b/drivers/thermal/rcar_gen3_thermal.c
index e1e412348076..ada3cc5adc02 100644
--- a/drivers/thermal/rcar_gen3_thermal.c
+++ b/drivers/thermal/rcar_gen3_thermal.c
@@ -310,6 +310,7 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 	const int *rcar_gen3_ths_tj_1 = of_device_get_match_data(dev);
 	struct resource *res;
 	struct thermal_zone_device *zone;
+	const struct soc_device_attribute *attr;
 	int ret, i;
 
 	/* default values if FUSEs are missing */
@@ -321,7 +322,8 @@ static int rcar_gen3_thermal_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	priv->thermal_init = rcar_gen3_thermal_init;
-	if (soc_device_match(r8a7795es1))
+	attr = soc_device_match(r8a7795es1);
+	if (!IS_ERR(attr) && attr)
 		priv->thermal_init = rcar_gen3_thermal_init_r8a7795es1;
 
 	platform_set_drvdata(pdev, priv);
diff --git a/drivers/thermal/ti-soc-thermal/ti-bandgap.c b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
index d81af89166d2..eb9b7bcbd934 100644
--- a/drivers/thermal/ti-soc-thermal/ti-bandgap.c
+++ b/drivers/thermal/ti-soc-thermal/ti-bandgap.c
@@ -886,6 +886,9 @@ static const struct soc_device_attribute soc_no_cpu_notifier[] = {
 static
 int ti_bandgap_probe(struct platform_device *pdev)
 {
+#ifdef CONFIG_PM_SLEEP
+	const struct soc_device_attribute *match;
+#endif
 	struct ti_bandgap *bgp;
 	int clk_rate, ret, i;
 
@@ -1037,7 +1040,8 @@ int ti_bandgap_probe(struct platform_device *pdev)
 
 #ifdef CONFIG_PM_SLEEP
 	bgp->nb.notifier_call = bandgap_omap_cpu_notifier;
-	if (!soc_device_match(soc_no_cpu_notifier))
+	match = soc_device_match(soc_no_cpu_notifier);
+	if (!IS_ERR(match) && !match)
 		cpu_pm_register_notifier(&bgp->nb);
 #endif
 
@@ -1072,9 +1076,11 @@ static
 int ti_bandgap_remove(struct platform_device *pdev)
 {
 	struct ti_bandgap *bgp = platform_get_drvdata(pdev);
+	const struct soc_device_attribute *attr;
 	int i;
 
-	if (!soc_device_match(soc_no_cpu_notifier))
+	soc = soc_device_match(soc_no_cpu_notifier);
+	if (!IS_ERR(attr) && !attr)
 		cpu_pm_unregister_notifier(&bgp->nb);
 
 	/* Remove sensor interfaces */
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index 0c418ce50ba0..dfc73e0187bd 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -2753,7 +2753,7 @@ static int renesas_usb3_probe(struct platform_device *pdev)
 	const struct soc_device_attribute *attr;
 
 	attr = soc_device_match(renesas_usb3_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		priv = attr->data;
 	else
 		priv = of_device_get_match_data(&pdev->dev);
diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
index c70f2d0b4aaf..5d9cd7797ec1 100644
--- a/drivers/usb/host/ehci-platform.c
+++ b/drivers/usb/host/ehci-platform.c
@@ -243,6 +243,7 @@ static int ehci_platform_probe(struct platform_device *dev)
 	struct usb_ehci_pdata *pdata = dev_get_platdata(&dev->dev);
 	struct ehci_platform_priv *priv;
 	struct ehci_hcd *ehci;
+	const struct soc_device_attribute *match;
 	int err, irq, clk = 0;
 
 	if (usb_disabled())
@@ -297,7 +298,8 @@ static int ehci_platform_probe(struct platform_device *dev)
 					  "has-transaction-translator"))
 			hcd->has_tt = 1;
 
-		if (soc_device_match(quirk_poll_match))
+		match = soc_device_match(quirk_poll_match);
+		if (!IS_ERR(match) && match)
 			priv->quirk_poll = true;
 
 		for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
index 1bc4fe7b8c75..41bb59d0e975 100644
--- a/drivers/usb/host/xhci-rcar.c
+++ b/drivers/usb/host/xhci-rcar.c
@@ -135,7 +135,7 @@ static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 	const char *firmware_name;
 
 	attr = soc_device_match(rcar_quirks_match);
-	if (attr)
+	if (!IS_ERR(attr) && attr)
 		quirks = (uintptr_t)attr->data;
 
 	if (quirks & RCAR_XHCI_FIRMWARE_V2)
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 5791198960e6..fdc534dc4024 100644
--- a/drivers/watchdog/renesas_wdt.c
+++ b/drivers/watchdog/renesas_wdt.c
@@ -197,7 +197,7 @@ static bool rwdt_blacklisted(struct device *dev)
 	const struct soc_device_attribute *attr;
 
 	attr = soc_device_match(rwdt_quirks_match);
-	if (attr && setup_max_cpus > (uintptr_t)attr->data) {
+	if (!IS_ERR(attr) && attr && setup_max_cpus > (uintptr_t)attr->data) {
 		dev_info(dev, "Watchdog blacklisted on %s %s\n", attr->soc_id,
 			 attr->revision);
 		return true;
-- 
2.17.1

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Leon Romanovsky]

On Mon, Apr 19, 2021 at 12:27:22PM +0800, Alice Guo (OSS) wrote:
> From: Alice Guo <alice.guo@nxp.com>
> 
> Update all the code that use soc_device_match because add support for
> soc_device_match returning -EPROBE_DEFER.
> 
> Signed-off-by: Alice Guo <alice.guo@nxp.com>
> ---
>  drivers/bus/ti-sysc.c                         |  2 +-
>  drivers/clk/renesas/r8a7795-cpg-mssr.c        |  4 +++-
>  drivers/clk/renesas/rcar-gen2-cpg.c           |  2 +-
>  drivers/clk/renesas/rcar-gen3-cpg.c           |  2 +-
>  drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c       |  7 ++++++-
>  drivers/dma/ti/k3-psil.c                      |  3 +++
>  drivers/dma/ti/k3-udma.c                      |  2 +-
>  drivers/gpu/drm/bridge/nwl-dsi.c              |  2 +-
>  drivers/gpu/drm/meson/meson_drv.c             |  4 +++-
>  drivers/gpu/drm/omapdrm/dss/dispc.c           |  2 +-
>  drivers/gpu/drm/omapdrm/dss/dpi.c             |  4 +++-
>  drivers/gpu/drm/omapdrm/dss/dsi.c             |  3 +++
>  drivers/gpu/drm/omapdrm/dss/dss.c             |  3 +++
>  drivers/gpu/drm/omapdrm/dss/hdmi4_core.c      |  3 +++
>  drivers/gpu/drm/omapdrm/dss/venc.c            |  4 +++-
>  drivers/gpu/drm/omapdrm/omap_drv.c            |  3 +++
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  4 +++-
>  drivers/gpu/drm/rcar-du/rcar_lvds.c           |  2 +-
>  drivers/gpu/drm/tidss/tidss_dispc.c           |  4 +++-
>  drivers/iommu/ipmmu-vmsa.c                    |  7 +++++--
>  drivers/media/platform/rcar-vin/rcar-core.c   |  2 +-
>  drivers/media/platform/rcar-vin/rcar-csi2.c   |  2 +-
>  drivers/media/platform/vsp1/vsp1_uif.c        |  4 +++-
>  drivers/mmc/host/renesas_sdhi_core.c          |  2 +-
>  drivers/mmc/host/renesas_sdhi_internal_dmac.c |  2 +-
>  drivers/mmc/host/sdhci-of-esdhc.c             | 21 ++++++++++++++-----
>  drivers/mmc/host/sdhci-omap.c                 |  2 +-
>  drivers/mmc/host/sdhci_am654.c                |  2 +-
>  drivers/net/ethernet/renesas/ravb_main.c      |  4 +++-
>  drivers/net/ethernet/ti/am65-cpsw-nuss.c      |  2 +-
>  drivers/net/ethernet/ti/cpsw.c                |  2 +-
>  drivers/net/ethernet/ti/cpsw_new.c            |  2 +-
>  drivers/phy/ti/phy-omap-usb2.c                |  4 +++-
>  drivers/pinctrl/renesas/core.c                |  2 +-
>  drivers/pinctrl/renesas/pfc-r8a7790.c         |  5 ++++-
>  drivers/pinctrl/renesas/pfc-r8a7794.c         |  5 ++++-
>  drivers/soc/fsl/dpio/dpio-driver.c            | 13 ++++++++----
>  drivers/soc/renesas/r8a774c0-sysc.c           |  5 ++++-
>  drivers/soc/renesas/r8a7795-sysc.c            |  2 +-
>  drivers/soc/renesas/r8a77990-sysc.c           |  5 ++++-
>  drivers/soc/ti/k3-ringacc.c                   |  2 +-
>  drivers/staging/mt7621-pci/pci-mt7621.c       |  2 +-
>  drivers/thermal/rcar_gen3_thermal.c           |  4 +++-
>  drivers/thermal/ti-soc-thermal/ti-bandgap.c   | 10 +++++++--
>  drivers/usb/gadget/udc/renesas_usb3.c         |  2 +-
>  drivers/usb/host/ehci-platform.c              |  4 +++-
>  drivers/usb/host/xhci-rcar.c                  |  2 +-
>  drivers/watchdog/renesas_wdt.c                |  2 +-
>  48 files changed, 131 insertions(+), 52 deletions(-)
> 
> diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> index 5fae60f8c135..00c59aa217c1 100644
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -2909,7 +2909,7 @@ static int sysc_init_soc(struct sysc *ddata)
>  	}
>  
>  	match = soc_device_match(sysc_soc_feat_match);
> -	if (!match)
> +	if (!match || IS_ERR(match))
>  		return 0;
>  
>  	if (match->data)
> diff --git a/drivers/clk/renesas/r8a7795-cpg-mssr.c b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> index c32d2c678046..90a18336a4c3 100644
> --- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> +++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> @@ -439,6 +439,7 @@ static const unsigned int r8a7795es2_mod_nullify[] __initconst = {
>  
>  static int __init r8a7795_cpg_mssr_init(struct device *dev)
>  {
> +	const struct soc_device_attribute *match;
>  	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
>  	u32 cpg_mode;
>  	int error;
> @@ -453,7 +454,8 @@ static int __init r8a7795_cpg_mssr_init(struct device *dev)
>  		return -EINVAL;
>  	}
>  
> -	if (soc_device_match(r8a7795es1)) {
> +	match = soc_device_match(r8a7795es1);
> +	if (!IS_ERR(match) && match) {

"if (!IS_ERR_OR_NULL(match))" in all places.

Thanks

RE: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Alice Guo (OSS)]

> -----Original Message-----
> From: Leon Romanovsky <leon@kernel.org>
> Sent: 2021年4月19日 13:02
> To: Alice Guo (OSS) <alice.guo@oss.nxp.com>
> Cc: gregkh@linuxfoundation.org; rafael@kernel.org; Horia Geanta
> <horia.geanta@nxp.com>; Aymen Sghaier <aymen.sghaier@nxp.com>;
> herbert@gondor.apana.org.au; davem@davemloft.net; tony@atomide.com;
> geert+renesas@glider.be; mturquette@baylibre.com; sboyd@kernel.org;
> vkoul@kernel.org; peter.ujfalusi@gmail.com; a.hajda@samsung.com;
> narmstrong@baylibre.com; robert.foss@linaro.org; airlied@linux.ie;
> daniel@ffwll.ch; khilman@baylibre.com; tomba@kernel.org; jyri.sarha@iki.fi;
> joro@8bytes.org; will@kernel.org; mchehab@kernel.org;
> ulf.hansson@linaro.org; adrian.hunter@intel.com; kishon@ti.com;
> kuba@kernel.org; linus.walleij@linaro.org; Roy Pledge <roy.pledge@nxp.com>;
> Leo Li <leoyang.li@nxp.com>; ssantosh@kernel.org; matthias.bgg@gmail.com;
> edubezval@gmail.com; j-keerthy@ti.com; balbi@kernel.org;
> linux@prisktech.co.nz; stern@rowland.harvard.edu; wim@linux-watchdog.org;
> linux@roeck-us.net; linux-kernel@vger.kernel.org; linux-crypto@vger.kernel.org;
> linux-omap@vger.kernel.org; linux-renesas-soc@vger.kernel.org;
> linux-clk@vger.kernel.org; dmaengine@vger.kernel.org;
> dri-devel@lists.freedesktop.org; linux-amlogic@lists.infradead.org;
> linux-arm-kernel@lists.infradead.org; iommu@lists.linux-foundation.org;
> linux-media@vger.kernel.org; linux-mmc@vger.kernel.org;
> netdev@vger.kernel.org; linux-phy@lists.infradead.org;
> linux-gpio@vger.kernel.org; linuxppc-dev@lists.ozlabs.org;
> linux-staging@lists.linux.dev; linux-mediatek@lists.infradead.org;
> linux-pm@vger.kernel.org; linux-usb@vger.kernel.org;
> linux-watchdog@vger.kernel.org
> Subject: Re: [RFC v1 PATCH 3/3] driver: update all the code that use
> soc_device_match
> 
> On Mon, Apr 19, 2021 at 12:27:22PM +0800, Alice Guo (OSS) wrote:
> > From: Alice Guo <alice.guo@nxp.com>
> >
> > Update all the code that use soc_device_match because add support for
> > soc_device_match returning -EPROBE_DEFER.
> >
> > Signed-off-by: Alice Guo <alice.guo@nxp.com>
> > ---
> >  drivers/bus/ti-sysc.c                         |  2 +-
> >  drivers/clk/renesas/r8a7795-cpg-mssr.c        |  4 +++-
> >  drivers/clk/renesas/rcar-gen2-cpg.c           |  2 +-
> >  drivers/clk/renesas/rcar-gen3-cpg.c           |  2 +-
> >  drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c       |  7 ++++++-
> >  drivers/dma/ti/k3-psil.c                      |  3 +++
> >  drivers/dma/ti/k3-udma.c                      |  2 +-
> >  drivers/gpu/drm/bridge/nwl-dsi.c              |  2 +-
> >  drivers/gpu/drm/meson/meson_drv.c             |  4 +++-
> >  drivers/gpu/drm/omapdrm/dss/dispc.c           |  2 +-
> >  drivers/gpu/drm/omapdrm/dss/dpi.c             |  4 +++-
> >  drivers/gpu/drm/omapdrm/dss/dsi.c             |  3 +++
> >  drivers/gpu/drm/omapdrm/dss/dss.c             |  3 +++
> >  drivers/gpu/drm/omapdrm/dss/hdmi4_core.c      |  3 +++
> >  drivers/gpu/drm/omapdrm/dss/venc.c            |  4 +++-
> >  drivers/gpu/drm/omapdrm/omap_drv.c            |  3 +++
> >  drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  4 +++-
> >  drivers/gpu/drm/rcar-du/rcar_lvds.c           |  2 +-
> >  drivers/gpu/drm/tidss/tidss_dispc.c           |  4 +++-
> >  drivers/iommu/ipmmu-vmsa.c                    |  7 +++++--
> >  drivers/media/platform/rcar-vin/rcar-core.c   |  2 +-
> >  drivers/media/platform/rcar-vin/rcar-csi2.c   |  2 +-
> >  drivers/media/platform/vsp1/vsp1_uif.c        |  4 +++-
> >  drivers/mmc/host/renesas_sdhi_core.c          |  2 +-
> >  drivers/mmc/host/renesas_sdhi_internal_dmac.c |  2 +-
> >  drivers/mmc/host/sdhci-of-esdhc.c             | 21
> ++++++++++++++-----
> >  drivers/mmc/host/sdhci-omap.c                 |  2 +-
> >  drivers/mmc/host/sdhci_am654.c                |  2 +-
> >  drivers/net/ethernet/renesas/ravb_main.c      |  4 +++-
> >  drivers/net/ethernet/ti/am65-cpsw-nuss.c      |  2 +-
> >  drivers/net/ethernet/ti/cpsw.c                |  2 +-
> >  drivers/net/ethernet/ti/cpsw_new.c            |  2 +-
> >  drivers/phy/ti/phy-omap-usb2.c                |  4 +++-
> >  drivers/pinctrl/renesas/core.c                |  2 +-
> >  drivers/pinctrl/renesas/pfc-r8a7790.c         |  5 ++++-
> >  drivers/pinctrl/renesas/pfc-r8a7794.c         |  5 ++++-
> >  drivers/soc/fsl/dpio/dpio-driver.c            | 13 ++++++++----
> >  drivers/soc/renesas/r8a774c0-sysc.c           |  5 ++++-
> >  drivers/soc/renesas/r8a7795-sysc.c            |  2 +-
> >  drivers/soc/renesas/r8a77990-sysc.c           |  5 ++++-
> >  drivers/soc/ti/k3-ringacc.c                   |  2 +-
> >  drivers/staging/mt7621-pci/pci-mt7621.c       |  2 +-
> >  drivers/thermal/rcar_gen3_thermal.c           |  4 +++-
> >  drivers/thermal/ti-soc-thermal/ti-bandgap.c   | 10 +++++++--
> >  drivers/usb/gadget/udc/renesas_usb3.c         |  2 +-
> >  drivers/usb/host/ehci-platform.c              |  4 +++-
> >  drivers/usb/host/xhci-rcar.c                  |  2 +-
> >  drivers/watchdog/renesas_wdt.c                |  2 +-
> >  48 files changed, 131 insertions(+), 52 deletions(-)
> >
> > diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index
> > 5fae60f8c135..00c59aa217c1 100644
> > --- a/drivers/bus/ti-sysc.c
> > +++ b/drivers/bus/ti-sysc.c
> > @@ -2909,7 +2909,7 @@ static int sysc_init_soc(struct sysc *ddata)
> >  	}
> >
> >  	match = soc_device_match(sysc_soc_feat_match);
> > -	if (!match)
> > +	if (!match || IS_ERR(match))
> >  		return 0;
> >
> >  	if (match->data)
> > diff --git a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > index c32d2c678046..90a18336a4c3 100644
> > --- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > +++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > @@ -439,6 +439,7 @@ static const unsigned int r8a7795es2_mod_nullify[]
> > __initconst = {
> >
> >  static int __init r8a7795_cpg_mssr_init(struct device *dev)  {
> > +	const struct soc_device_attribute *match;
> >  	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
> >  	u32 cpg_mode;
> >  	int error;
> > @@ -453,7 +454,8 @@ static int __init r8a7795_cpg_mssr_init(struct device
> *dev)
> >  		return -EINVAL;
> >  	}
> >
> > -	if (soc_device_match(r8a7795es1)) {
> > +	match = soc_device_match(r8a7795es1);
> > +	if (!IS_ERR(match) && match) {
> 
> "if (!IS_ERR_OR_NULL(match))" in all places.

Thank you for your suggestion. I will modify them.

Best Regards,
Alice Guo

> Thanks

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Dominique MARTINET]

Alice Guo (OSS) wrote on Mon, Apr 19, 2021 at 12:27:22PM +0800:
> From: Alice Guo <alice.guo@nxp.com>
> 
> Update all the code that use soc_device_match

A single patch might be difficult to accept for all components, a each
maintainer will probably want to have a say on their subsystem?

I would suggest to split these for a non-RFC version; a this will really
need to be case-by-case handling.

> because add support for soc_device_match returning -EPROBE_DEFER.

(English does not parse here for me)

I've only commented a couple of places in the code itself, but this
doesn't seem to add much support for errors, just sweep the problem
under the rug.

> Signed-off-by: Alice Guo <alice.guo@nxp.com>
> ---
> 
> diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> index 5fae60f8c135..00c59aa217c1 100644
> --- a/drivers/bus/ti-sysc.c
> +++ b/drivers/bus/ti-sysc.c
> @@ -2909,7 +2909,7 @@ static int sysc_init_soc(struct sysc *ddata)
>  	}
>  
>  	match = soc_device_match(sysc_soc_feat_match);
> -	if (!match)
> +	if (!match || IS_ERR(match))
>  		return 0;

This function handles errors, I would recommend returning the error as
is if soc_device_match returned one so the probe can be retried later.

>  
>  	if (match->data)
> diff --git a/drivers/clk/renesas/r8a7795-cpg-mssr.c b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> index c32d2c678046..90a18336a4c3 100644
> --- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> +++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> @@ -439,6 +439,7 @@ static const unsigned int r8a7795es2_mod_nullify[] __initconst = {
>  
>  static int __init r8a7795_cpg_mssr_init(struct device *dev)
>  {
> +	const struct soc_device_attribute *match;
>  	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
>  	u32 cpg_mode;
>  	int error;
> @@ -453,7 +454,8 @@ static int __init r8a7795_cpg_mssr_init(struct device *dev)
>  		return -EINVAL;
>  	}
>  
> -	if (soc_device_match(r8a7795es1)) {
> +	match = soc_device_match(r8a7795es1);
> +	if (!IS_ERR(match) && match) {

Same, return the error.
Assuming an error means no match will just lead to hard to debug
problems because the driver potentially assumed the wrong device when
it's just not ready yet.

>  		cpg_core_nullify_range(r8a7795_core_clks,
>  				       ARRAY_SIZE(r8a7795_core_clks),
>  				       R8A7795_CLK_S0D2, R8A7795_CLK_S0D12);
> [...]
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index eaaec0a55cc6..13a06b613379 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -757,17 +757,20 @@ static const char * const devices_allowlist[] = {
>  
>  static bool ipmmu_device_is_allowed(struct device *dev)
>  {
> +	const struct soc_device_attribute *match1, *match2;
>  	unsigned int i;
>  
>  	/*
>  	 * R-Car Gen3 and RZ/G2 use the allow list to opt-in devices.
>  	 * For Other SoCs, this returns true anyway.
>  	 */
> -	if (!soc_device_match(soc_needs_opt_in))
> +	match1 = soc_device_match(soc_needs_opt_in);
> +	if (!IS_ERR(match1) && !match1)

I'm not sure what you intended to do, but !match1 already means there is
no error so the original code is identical.

In this case ipmmu_device_is_allowed does not allow errors so this is
one of the "difficult" drivers that require slightly more thinking.
It is only called in ipmmu_of_xlate which does return errors properly,
so in this case the most straightforward approach would be to make
ipmmu_device_is_allowed return an int and forward errors as well.



...
This is going to need quite some more work to be acceptable, in my
opinion, but I think it should be possible.

Thanks,
-- 
Dominique

RE: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Alice Guo (OSS)]

> -----Original Message-----
> From: Dominique MARTINET <dominique.martinet@atmark-techno.com>
> Sent: 2021年4月19日 13:03
> To: Alice Guo (OSS) <alice.guo@oss.nxp.com>
> Subject: Re: [RFC v1 PATCH 3/3] driver: update all the code that use
> soc_device_match
> 
> Alice Guo (OSS) wrote on Mon, Apr 19, 2021 at 12:27:22PM +0800:
> > From: Alice Guo <alice.guo@nxp.com>
> >
> > Update all the code that use soc_device_match
> 
> A single patch might be difficult to accept for all components, a each maintainer
> will probably want to have a say on their subsystem?
> 
> I would suggest to split these for a non-RFC version; a this will really need to be
> case-by-case handling.
> 
> > because add support for soc_device_match returning -EPROBE_DEFER.
> 
> (English does not parse here for me)
> 
> I've only commented a couple of places in the code itself, but this doesn't seem
> to add much support for errors, just sweep the problem under the rug.
> 
> > Signed-off-by: Alice Guo <alice.guo@nxp.com>
> > ---
> >
> > diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c index
> > 5fae60f8c135..00c59aa217c1 100644
> > --- a/drivers/bus/ti-sysc.c
> > +++ b/drivers/bus/ti-sysc.c
> > @@ -2909,7 +2909,7 @@ static int sysc_init_soc(struct sysc *ddata)
> >  	}
> >
> >  	match = soc_device_match(sysc_soc_feat_match);
> > -	if (!match)
> > +	if (!match || IS_ERR(match))
> >  		return 0;
> 
> This function handles errors, I would recommend returning the error as is if
> soc_device_match returned one so the probe can be retried later.
> 
> >
> >  	if (match->data)
> > diff --git a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > index c32d2c678046..90a18336a4c3 100644
> > --- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > +++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > @@ -439,6 +439,7 @@ static const unsigned int r8a7795es2_mod_nullify[]
> > __initconst = {
> >
> >  static int __init r8a7795_cpg_mssr_init(struct device *dev)  {
> > +	const struct soc_device_attribute *match;
> >  	const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
> >  	u32 cpg_mode;
> >  	int error;
> > @@ -453,7 +454,8 @@ static int __init r8a7795_cpg_mssr_init(struct device
> *dev)
> >  		return -EINVAL;
> >  	}
> >
> > -	if (soc_device_match(r8a7795es1)) {
> > +	match = soc_device_match(r8a7795es1);
> > +	if (!IS_ERR(match) && match) {
> 
> Same, return the error.
> Assuming an error means no match will just lead to hard to debug problems
> because the driver potentially assumed the wrong device when it's just not
> ready yet.
> 
> >  		cpg_core_nullify_range(r8a7795_core_clks,
> >  				       ARRAY_SIZE(r8a7795_core_clks),
> >  				       R8A7795_CLK_S0D2, R8A7795_CLK_S0D12); [...]
> diff --git
> > a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c index
> > eaaec0a55cc6..13a06b613379 100644
> > --- a/drivers/iommu/ipmmu-vmsa.c
> > +++ b/drivers/iommu/ipmmu-vmsa.c
> > @@ -757,17 +757,20 @@ static const char * const devices_allowlist[] =
> > {
> >
> >  static bool ipmmu_device_is_allowed(struct device *dev)  {
> > +	const struct soc_device_attribute *match1, *match2;
> >  	unsigned int i;
> >
> >  	/*
> >  	 * R-Car Gen3 and RZ/G2 use the allow list to opt-in devices.
> >  	 * For Other SoCs, this returns true anyway.
> >  	 */
> > -	if (!soc_device_match(soc_needs_opt_in))
> > +	match1 = soc_device_match(soc_needs_opt_in);
> > +	if (!IS_ERR(match1) && !match1)
> 
> I'm not sure what you intended to do, but !match1 already means there is no
> error so the original code is identical.
> 
> In this case ipmmu_device_is_allowed does not allow errors so this is one of the
> "difficult" drivers that require slightly more thinking.
> It is only called in ipmmu_of_xlate which does return errors properly, so in this
> case the most straightforward approach would be to make
> ipmmu_device_is_allowed return an int and forward errors as well.
> 

I will reconsider the existing problems. Thank you for your advice

> 
> ...
> This is going to need quite some more work to be acceptable, in my opinion, but
> I think it should be possible.
> 
> Thanks,
> --
> Dominique

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Geert Uytterhoeven]

Hi Dominique,

CC Arnd (soc_device_match() author)

On Mon, Apr 19, 2021 at 7:03 AM Dominique MARTINET
<dominique.martinet@atmark-techno.com> wrote:
> Alice Guo (OSS) wrote on Mon, Apr 19, 2021 at 12:27:22PM +0800:
> > From: Alice Guo <alice.guo@nxp.com>
> > Update all the code that use soc_device_match
>
> A single patch might be difficult to accept for all components, a each
> maintainer will probably want to have a say on their subsystem?
>
> I would suggest to split these for a non-RFC version; a this will really
> need to be case-by-case handling.
>
> > because add support for soc_device_match returning -EPROBE_DEFER.
>
> (English does not parse here for me)
>
> I've only commented a couple of places in the code itself, but this
> doesn't seem to add much support for errors, just sweep the problem
> under the rug.
>
> > Signed-off-by: Alice Guo <alice.guo@nxp.com>
> > ---
> >
> > diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
> > index 5fae60f8c135..00c59aa217c1 100644
> > --- a/drivers/bus/ti-sysc.c
> > +++ b/drivers/bus/ti-sysc.c
> > @@ -2909,7 +2909,7 @@ static int sysc_init_soc(struct sysc *ddata)
> >       }
> >
> >       match = soc_device_match(sysc_soc_feat_match);
> > -     if (!match)
> > +     if (!match || IS_ERR(match))
> >               return 0;
>
> This function handles errors, I would recommend returning the error as
> is if soc_device_match returned one so the probe can be retried later.

Depends...

> > --- a/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > +++ b/drivers/clk/renesas/r8a7795-cpg-mssr.c
> > @@ -439,6 +439,7 @@ static const unsigned int r8a7795es2_mod_nullify[] __initconst = {
> >
> >  static int __init r8a7795_cpg_mssr_init(struct device *dev)
> >  {
> > +     const struct soc_device_attribute *match;
> >       const struct rcar_gen3_cpg_pll_config *cpg_pll_config;
> >       u32 cpg_mode;
> >       int error;
> > @@ -453,7 +454,8 @@ static int __init r8a7795_cpg_mssr_init(struct device *dev)
> >               return -EINVAL;
> >       }
> >
> > -     if (soc_device_match(r8a7795es1)) {
> > +     match = soc_device_match(r8a7795es1);
> > +     if (!IS_ERR(match) && match) {
>
> Same, return the error.
> Assuming an error means no match will just lead to hard to debug
> problems because the driver potentially assumed the wrong device when
> it's just not ready yet.

When running on R-Car H3, there will always be a match device, as
the SoC device is registered early.

>
> >               cpg_core_nullify_range(r8a7795_core_clks,
> >                                      ARRAY_SIZE(r8a7795_core_clks),
> >                                      R8A7795_CLK_S0D2, R8A7795_CLK_S0D12);
> > [...]
> > diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> > index eaaec0a55cc6..13a06b613379 100644
> > --- a/drivers/iommu/ipmmu-vmsa.c
> > +++ b/drivers/iommu/ipmmu-vmsa.c
> > @@ -757,17 +757,20 @@ static const char * const devices_allowlist[] = {
> >
> >  static bool ipmmu_device_is_allowed(struct device *dev)
> >  {
> > +     const struct soc_device_attribute *match1, *match2;
> >       unsigned int i;
> >
> >       /*
> >        * R-Car Gen3 and RZ/G2 use the allow list to opt-in devices.
> >        * For Other SoCs, this returns true anyway.
> >        */
> > -     if (!soc_device_match(soc_needs_opt_in))
> > +     match1 = soc_device_match(soc_needs_opt_in);
> > +     if (!IS_ERR(match1) && !match1)
>
> I'm not sure what you intended to do, but !match1 already means there is
> no error so the original code is identical.
>
> In this case ipmmu_device_is_allowed does not allow errors so this is
> one of the "difficult" drivers that require slightly more thinking.
> It is only called in ipmmu_of_xlate which does return errors properly,
> so in this case the most straightforward approach would be to make
> ipmmu_device_is_allowed return an int and forward errors as well.
>
> ...
> This is going to need quite some more work to be acceptable, in my
> opinion, but I think it should be possible.

In general, this is very hard to do, IMHO. Some drivers may be used on
multiple platforms, some of them registering an SoC device, some of
them not registering an SoC device.  So there is no way to know the
difference between "SoC device not registered, intentionally", and
"SoC device not yet registered".

soc_device_match() should only be used as a last resort, to identify
systems that cannot be identified otherwise.  Typically this is used for
quirks, which should only be enabled on a very specific subset of
systems.  IMHO such systems should make sure soc_device_match()
is available early, by registering their SoC device early.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Dominique MARTINET]

Geert Uytterhoeven wrote on Mon, Apr 19, 2021 at 11:03:24AM +0200:
> > This is going to need quite some more work to be acceptable, in my
> > opinion, but I think it should be possible.
> 
> In general, this is very hard to do, IMHO. Some drivers may be used on
> multiple platforms, some of them registering an SoC device, some of
> them not registering an SoC device.  So there is no way to know the
> difference between "SoC device not registered, intentionally", and
> "SoC device not yet registered".

Hm, good point, I was probably a bit too optimistic if there are devices
which don't register any soc yet have drivers which want one; I don't
see how to make the difference indeed... And that does mean we can't
just defer all the time.

> soc_device_match() should only be used as a last resort, to identify
> systems that cannot be identified otherwise.  Typically this is used for
> quirks, which should only be enabled on a very specific subset of
> systems.  IMHO such systems should make sure soc_device_match()
> is available early, by registering their SoC device early.

I definitely agree there, my suggestion to defer was only because I know
of no other way to influence the ordering of drivers loading reliably
and gave up on soc being init'd early.

In this particular case the problem is that since 7d981405d0fd ("soc:
imx8m: change to use platform driver") the soc probe tries to use the
nvmem driver for ocotp fuses for imx8m devices, which isn't ready yet.
So soc loading gets pushed back to the end of the list because it gets
defered and other drivers relying on soc_device_match get confused
because they wrongly think a device doesn't match a quirk when it
actually does.

If there is a way to ensure the nvmem driver gets loaded before the soc,
that would also solve the problem nicely, and avoid the need to mess
with all the ~50 drivers which use it.


Is there a way to control in what order drivers get loaded? Something in
the dtb perhaps?


Thanks,
-- 
Dominique

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Arnd Bergmann]

On Mon, Apr 19, 2021 at 11:33 AM Dominique MARTINET
<dominique.martinet@atmark-techno.com> wrote:
> Geert Uytterhoeven wrote on Mon, Apr 19, 2021 at 11:03:24AM +0200:
>
> > soc_device_match() should only be used as a last resort, to identify
> > systems that cannot be identified otherwise.  Typically this is used for
> > quirks, which should only be enabled on a very specific subset of
> > systems.  IMHO such systems should make sure soc_device_match()
> > is available early, by registering their SoC device early.
>
> I definitely agree there, my suggestion to defer was only because I know
> of no other way to influence the ordering of drivers loading reliably
> and gave up on soc being init'd early.

In some cases, you can use the device_link infrastructure to deal
with dependencies between devices. Not sure if this would help
in your case, but have a look at device_link_add() etc in drivers/base/core.c

> In this particular case the problem is that since 7d981405d0fd ("soc:
> imx8m: change to use platform driver") the soc probe tries to use the
> nvmem driver for ocotp fuses for imx8m devices, which isn't ready yet.
> So soc loading gets pushed back to the end of the list because it gets
> defered and other drivers relying on soc_device_match get confused
> because they wrongly think a device doesn't match a quirk when it
> actually does.
>
> If there is a way to ensure the nvmem driver gets loaded before the soc,
> that would also solve the problem nicely, and avoid the need to mess
> with all the ~50 drivers which use it.
>
> Is there a way to control in what order drivers get loaded? Something in
> the dtb perhaps?

For built-in drivers, load order depends on the initcall level and
link order (how things are lined listed in the Makefile hierarchy).

For loadable modules, this is up to user space in the end.

Which of the drivers in this scenario are loadable modules?

        Arnd

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Dominique MARTINET]

Arnd Bergmann wrote on Mon, Apr 19, 2021 at 02:16:36PM +0200:
> In some cases, you can use the device_link infrastructure to deal
> with dependencies between devices. Not sure if this would help
> in your case, but have a look at device_link_add() etc in drivers/base/core.c

I'll need to actually try to convince myself but if creating the link
forces driver registration then it should be workable.

> > In this particular case the problem is that since 7d981405d0fd ("soc:
> > imx8m: change to use platform driver") the soc probe tries to use the
> > nvmem driver for ocotp fuses for imx8m devices, which isn't ready yet.
> > So soc loading gets pushed back to the end of the list because it gets
> > defered and other drivers relying on soc_device_match get confused
> > because they wrongly think a device doesn't match a quirk when it
> > actually does.
> >
> > If there is a way to ensure the nvmem driver gets loaded before the soc,
> > that would also solve the problem nicely, and avoid the need to mess
> > with all the ~50 drivers which use it.
> >
> > Is there a way to control in what order drivers get loaded? Something in
> > the dtb perhaps?
> 
> For built-in drivers, load order depends on the initcall level and
> link order (how things are lined listed in the Makefile hierarchy).
> 
> For loadable modules, this is up to user space in the end.
> 
> Which of the drivers in this scenario are loadable modules?

All the drivers involved in my case are built-in (nvmem, soc and final
soc_device_match consumer e.g. caam_jr that crashes the kernel if soc is
not identified properly).

I frankly don't like the idea of moving nvmem/ above soc/ in
drivers/Makefile as a "solution" to this (especially as there is one
that seems to care about what soc they run on...), so I'll have a look
at links first, hopefully that will work out.


Thanks,
-- 
Dominique

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Arnd Bergmann]

On Tue, Apr 20, 2021 at 1:44 AM Dominique MARTINET
<dominique.martinet@atmark-techno.com> wrote:
> Arnd Bergmann wrote on Mon, Apr 19, 2021 at 02:16:36PM +0200:
> > For built-in drivers, load order depends on the initcall level and
> > link order (how things are lined listed in the Makefile hierarchy).
> >
> > For loadable modules, this is up to user space in the end.
> >
> > Which of the drivers in this scenario are loadable modules?
>
> All the drivers involved in my case are built-in (nvmem, soc and final
> soc_device_match consumer e.g. caam_jr that crashes the kernel if soc is
> not identified properly).

Ok, in that case you may have a chance to just adapt the initcall
levels. This is somewhat fragile if someone else already relies
on a particular order, but it's an easy one-line change to change
a driver e.g. from module_init() or device_initcall() to arch_initcall().

> I frankly don't like the idea of moving nvmem/ above soc/ in
> drivers/Makefile as a "solution" to this (especially as there is one
> that seems to care about what soc they run on...), so I'll have a look
> at links first, hopefully that will work out.

Right, that would be way more fragile.

I think the main problem in this case is the caam driver that really
should not look into the particular SoC type or even machine
compatible string. This is something we can do as a last resort
for compatibility with busted devicetree files, but it appears that
this driver does it as the primary method for identifying different
hardware revisions. I would suggest fixing the binding so that
each SoC that includes one of these devices has a soc specific
compatible string associated with the device that the driver can
use as the primary way of identifying the device.

We probably need to keep the old logic around for old dtb files,
but there can at least be a comment next to that table that
discourages people from adding more entries there.

      Arnd

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Arnd Bergmann]

On Tue, Apr 20, 2021 at 1:44 AM Dominique MARTINET
<dominique.martinet@atmark-techno.com> wrote:
> Arnd Bergmann wrote on Mon, Apr 19, 2021 at 02:16:36PM +0200:
> > For built-in drivers, load order depends on the initcall level and
> > link order (how things are lined listed in the Makefile hierarchy).
> >
> > For loadable modules, this is up to user space in the end.
> >
> > Which of the drivers in this scenario are loadable modules?
>
> All the drivers involved in my case are built-in (nvmem, soc and final
> soc_device_match consumer e.g. caam_jr that crashes the kernel if soc is
> not identified properly).

Ok, in that case you may have a chance to just adapt the initcall
levels. This is somewhat fragile if someone else already relies
on a particular order, but it's an easy one-line change to change
a driver e.g. from module_init() or device_initcall() to arch_initcall().

> I frankly don't like the idea of moving nvmem/ above soc/ in
> drivers/Makefile as a "solution" to this (especially as there is one
> that seems to care about what soc they run on...), so I'll have a look
> at links first, hopefully that will work out.

Right, that would be way more fragile.

I think the main problem in this case is the caam driver that really
should not look into the particular SoC type or even machine
compatible string. This is something we can do as a last resort
for compatibility with busted devicetree files, but it appears that
this driver does it as the primary method for identifying different
hardware revisions. I would suggest fixing the binding so that
each SoC that includes one of these devices has a soc specific
compatible string associated with the device that the driver can
use as the primary way of identifying the device.

We probably need to keep the old logic around for old dtb files,
but there can at least be a comment next to that table that
discourages people from adding more entries there.

      Arnd

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Guenter Roeck]

On 4/18/21 9:27 PM, Alice Guo (OSS) wrote:
> From: Alice Guo <alice.guo@nxp.com>
> 
> Update all the code that use soc_device_match because add support for
> soc_device_match returning -EPROBE_DEFER.
> 
> Signed-off-by: Alice Guo <alice.guo@nxp.com>
> ---
[ ... ]
>  drivers/watchdog/renesas_wdt.c                |  2 +-
>  48 files changed, 131 insertions(+), 52 deletions(-)
> 
[ ... ]
> diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
> index 5791198960e6..fdc534dc4024 100644
> --- a/drivers/watchdog/renesas_wdt.c
> +++ b/drivers/watchdog/renesas_wdt.c
> @@ -197,7 +197,7 @@ static bool rwdt_blacklisted(struct device *dev)
>  	const struct soc_device_attribute *attr;
>  
>  	attr = soc_device_match(rwdt_quirks_match);
> -	if (attr && setup_max_cpus > (uintptr_t)attr->data) {
> +	if (!IS_ERR(attr) && attr && setup_max_cpus > (uintptr_t)attr->data) {

This is wrong. We can not make the decision below without having access
to attr. The function may wrongly return false if soc_device_match()
returns an error.

Guenter

>  		dev_info(dev, "Watchdog blacklisted on %s %s\n", attr->soc_id,
>  			 attr->revision);
>  		return true;
> 

Re: [RFC v1 PATCH 3/3] driver: update all the code that use soc_device_match

[Péter Ujfalusi]

Hi Alice,

On 4/19/21 7:27 AM, Alice Guo (OSS) wrote:
> From: Alice Guo <alice.guo@nxp.com>
> 
> Update all the code that use soc_device_match because add support for
> soc_device_match returning -EPROBE_DEFER.
> 
> Signed-off-by: Alice Guo <alice.guo@nxp.com>
> ---
>  drivers/bus/ti-sysc.c                         |  2 +-
>  drivers/clk/renesas/r8a7795-cpg-mssr.c        |  4 +++-
>  drivers/clk/renesas/rcar-gen2-cpg.c           |  2 +-
>  drivers/clk/renesas/rcar-gen3-cpg.c           |  2 +-
>  drivers/dma/fsl-dpaa2-qdma/dpaa2-qdma.c       |  7 ++++++-
>  drivers/dma/ti/k3-psil.c                      |  3 +++
>  drivers/dma/ti/k3-udma.c                      |  2 +-
>  drivers/gpu/drm/bridge/nwl-dsi.c              |  2 +-
>  drivers/gpu/drm/meson/meson_drv.c             |  4 +++-
>  drivers/gpu/drm/omapdrm/dss/dispc.c           |  2 +-
>  drivers/gpu/drm/omapdrm/dss/dpi.c             |  4 +++-
>  drivers/gpu/drm/omapdrm/dss/dsi.c             |  3 +++
>  drivers/gpu/drm/omapdrm/dss/dss.c             |  3 +++
>  drivers/gpu/drm/omapdrm/dss/hdmi4_core.c      |  3 +++
>  drivers/gpu/drm/omapdrm/dss/venc.c            |  4 +++-
>  drivers/gpu/drm/omapdrm/omap_drv.c            |  3 +++
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c        |  4 +++-
>  drivers/gpu/drm/rcar-du/rcar_lvds.c           |  2 +-
>  drivers/gpu/drm/tidss/tidss_dispc.c           |  4 +++-
>  drivers/iommu/ipmmu-vmsa.c                    |  7 +++++--
>  drivers/media/platform/rcar-vin/rcar-core.c   |  2 +-
>  drivers/media/platform/rcar-vin/rcar-csi2.c   |  2 +-
>  drivers/media/platform/vsp1/vsp1_uif.c        |  4 +++-
>  drivers/mmc/host/renesas_sdhi_core.c          |  2 +-
>  drivers/mmc/host/renesas_sdhi_internal_dmac.c |  2 +-
>  drivers/mmc/host/sdhci-of-esdhc.c             | 21 ++++++++++++++-----
>  drivers/mmc/host/sdhci-omap.c                 |  2 +-
>  drivers/mmc/host/sdhci_am654.c                |  2 +-
>  drivers/net/ethernet/renesas/ravb_main.c      |  4 +++-
>  drivers/net/ethernet/ti/am65-cpsw-nuss.c      |  2 +-
>  drivers/net/ethernet/ti/cpsw.c                |  2 +-
>  drivers/net/ethernet/ti/cpsw_new.c            |  2 +-
>  drivers/phy/ti/phy-omap-usb2.c                |  4 +++-
>  drivers/pinctrl/renesas/core.c                |  2 +-
>  drivers/pinctrl/renesas/pfc-r8a7790.c         |  5 ++++-
>  drivers/pinctrl/renesas/pfc-r8a7794.c         |  5 ++++-
>  drivers/soc/fsl/dpio/dpio-driver.c            | 13 ++++++++----
>  drivers/soc/renesas/r8a774c0-sysc.c           |  5 ++++-
>  drivers/soc/renesas/r8a7795-sysc.c            |  2 +-
>  drivers/soc/renesas/r8a77990-sysc.c           |  5 ++++-
>  drivers/soc/ti/k3-ringacc.c                   |  2 +-
>  drivers/staging/mt7621-pci/pci-mt7621.c       |  2 +-
>  drivers/thermal/rcar_gen3_thermal.c           |  4 +++-
>  drivers/thermal/ti-soc-thermal/ti-bandgap.c   | 10 +++++++--
>  drivers/usb/gadget/udc/renesas_usb3.c         |  2 +-
>  drivers/usb/host/ehci-platform.c              |  4 +++-
>  drivers/usb/host/xhci-rcar.c                  |  2 +-
>  drivers/watchdog/renesas_wdt.c                |  2 +-
>  48 files changed, 131 insertions(+), 52 deletions(-)
> 

...

> diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
> index 96ad21869ba7..50a4c8f0993d 100644
> --- a/drivers/dma/ti/k3-udma.c
> +++ b/drivers/dma/ti/k3-udma.c
> @@ -5188,7 +5188,7 @@ static int udma_probe(struct platform_device *pdev)
>  	ud->match_data = match->data;
>  
>  	soc = soc_device_match(k3_soc_devices);
> -	if (!soc) {
> +	if (!IS_ERR(soc) && !soc) {

this does not sound right...

if (!soc || IS_ERR(soc))
or
if (IS_ERR_OR_NULL(soc))
is even better.

>  		dev_err(dev, "No compatible SoC found\n");
>  		return -ENODEV;

There might be a clever macro for it, but:

return soc ? PTR_ERR(soc) : -ENODEV;

>  	}

-- 
Péter