From: Greg KH <gregkh@linuxfoundation.org>
To: Neil Armstrong <narmstrong@baylibre.com>
Cc: balbi@kernel.org, hanjie.lin@amlogic.com,
"kernelci.org bot" <bot@kernelci.org>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
yue.wang@amlogic.com, linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH for-5.8 2/2] usb: dwc3: meson-g12a: fix USB2 PHY initialization on G12A and A1 SoCs
Date: Wed, 27 May 2020 10:53:15 +0200 [thread overview]
Message-ID: <20200527085315.GA168054@kroah.com> (raw)
In-Reply-To: <40a874eb-1a2b-533e-ee3e-bd90510abaf9@baylibre.com>
On Wed, May 27, 2020 at 10:17:31AM +0200, Neil Armstrong wrote:
> Hi Martin,
>
> On 26/05/2020 22:29, Martin Blumenstingl wrote:
> > dwc3_meson_g12a_usb2_init_phy() crashes with NULL pointer on an SM1
> > board (which uses the same USB setup as G12A) dereference as reported
> > by the Kernel CI bot. This is because of the following call flow:
> > dwc3_meson_g12a_probe
> > priv->drvdata->setup_regmaps
> > dwc3_meson_g12a_setup_regmaps
> > priv->usb2_ports is still 0 so priv->u2p_regmap[i] will be NULL
> > dwc3_meson_g12a_get_phys
> > initializes priv->usb2_ports
> > priv->drvdata->usb_init
> > dwc3_meson_g12a_usb_init
> > dwc3_meson_g12a_usb_init_glue
> > dwc3_meson_g12a_usb2_init
> > priv->drvdata->usb2_init_phy
> > dwc3_meson_g12a_usb2_init_phy
> > dereferences priv->u2p_regmap[i]
> >
> > Call priv->drvdata->setup_regmaps only after dwc3_meson_g12a_get_phys so
> > priv->usb2_ports is initialized and the regmaps will be set up
> > correctly. This fixes the NULL dereference later on.
> >
> > Fixes: 013af227f58a97 ("usb: dwc3: meson-g12a: handle the phy and glue registers separately")
> > Reported-by: "kernelci.org bot" <bot@kernelci.org>
> > Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> > ---
> > drivers/usb/dwc3/dwc3-meson-g12a.c | 8 ++++----
> > 1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
> > index ce5388338389..1f7f4d88ed9d 100644
> > --- a/drivers/usb/dwc3/dwc3-meson-g12a.c
> > +++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
>
> [...]
>
> Fixes regression reported at [1] on SEI510 board based on Amlogic G12A.
>
> Felipe, Greg, can this be queued on uxb-next for 5.8 ?
>
> Acked-by: Neil Armstrong <narmstron@baylibre.com>
I can take this and patch 1/2 here if Felipe acks them.
thanks,
greg k-h
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next prev parent reply other threads:[~2020-05-27 8:53 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-26 20:29 [PATCH for-5.8 0/2] dwc3: meson-g12a: two fixes for v5.8 Martin Blumenstingl
2020-05-26 20:29 ` [PATCH for-5.8 1/2] usb: dwc3: meson-g12a: fix error path when fetching the reset line fails Martin Blumenstingl
2020-05-27 7:53 ` Neil Armstrong
2020-05-26 20:29 ` [PATCH for-5.8 2/2] usb: dwc3: meson-g12a: fix USB2 PHY initialization on G12A and A1 SoCs Martin Blumenstingl
2020-05-27 8:17 ` Neil Armstrong
2020-05-27 8:53 ` Greg KH [this message]
2020-05-27 12:56 ` Felipe Balbi
2020-07-07 18:51 ` [PATCH for-5.8 0/2] dwc3: meson-g12a: two fixes for v5.8 patchwork-bot+linux-amlogic
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