* [PATCH 1/3] drm/panel: kingdisplay-kd097d04: Delete panel on attach() failure
2021-09-24 0:33 [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach() Brian Norris
@ 2021-09-24 0:33 ` Brian Norris
2021-09-24 0:33 ` [PATCH 2/3] drm/panel: innolux-p079zca: " Brian Norris
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Brian Norris @ 2021-09-24 0:33 UTC (permalink / raw)
To: Sam Ravnborg, Thierry Reding
Cc: linux-kernel, dri-devel, Heiko Stuebner, Sumit Semwal,
Jagan Teki, Brian Norris
If we fail to attach (e.g., because 1 of 2 dual-DSI controllers aren't
ready), we leave a dangling drm_panel reference to freed memory. Clean
that up on failure.
Fixes: 2a994cbed6b2 ("drm/panel: Add Kingdisplay KD097D04 panel driver")
Signed-off-by: Brian Norris <briannorris@chromium.org>
---
drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c b/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
index 86e4213e8bb1..daccb1fd5fda 100644
--- a/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
+++ b/drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.c
@@ -406,7 +406,13 @@ static int kingdisplay_panel_probe(struct mipi_dsi_device *dsi)
if (err < 0)
return err;
- return mipi_dsi_attach(dsi);
+ err = mipi_dsi_attach(dsi);
+ if (err < 0) {
+ kingdisplay_panel_del(kingdisplay);
+ return err;
+ }
+
+ return 0;
}
static int kingdisplay_panel_remove(struct mipi_dsi_device *dsi)
--
2.33.0.685.g46640cef36-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 2/3] drm/panel: innolux-p079zca: Delete panel on attach() failure
2021-09-24 0:33 [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach() Brian Norris
2021-09-24 0:33 ` [PATCH 1/3] drm/panel: kingdisplay-kd097d04: Delete panel on attach() failure Brian Norris
@ 2021-09-24 0:33 ` Brian Norris
2021-09-24 0:33 ` [PATCH 3/3] drm/panel: Delete panel on mipi_dsi_attach() failure Brian Norris
2021-10-14 19:59 ` [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach() Sam Ravnborg
3 siblings, 0 replies; 5+ messages in thread
From: Brian Norris @ 2021-09-24 0:33 UTC (permalink / raw)
To: Sam Ravnborg, Thierry Reding
Cc: linux-kernel, dri-devel, Heiko Stuebner, Sumit Semwal,
Jagan Teki, Brian Norris
If we fail to attach (e.g., because 1 of 2 dual-DSI controllers aren't
ready), we leave a dangling drm_panel reference to freed memory. Clean
that up on failure.
This problem exists since the driver's introduction, but is especially
relevant after refactored for dual-DSI variants.
Fixes: 14c8f2e9f8ea ("drm/panel: add Innolux P079ZCA panel driver")
Fixes: 7ad4e4636c54 ("drm/panel: p079zca: Refactor panel driver to support multiple panels")
Signed-off-by: Brian Norris <briannorris@chromium.org>
---
drivers/gpu/drm/panel/panel-innolux-p079zca.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/panel/panel-innolux-p079zca.c b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
index aea316225391..f194b62e290c 100644
--- a/drivers/gpu/drm/panel/panel-innolux-p079zca.c
+++ b/drivers/gpu/drm/panel/panel-innolux-p079zca.c
@@ -484,6 +484,7 @@ static void innolux_panel_del(struct innolux_panel *innolux)
static int innolux_panel_probe(struct mipi_dsi_device *dsi)
{
const struct panel_desc *desc;
+ struct innolux_panel *innolux;
int err;
desc = of_device_get_match_data(&dsi->dev);
@@ -495,7 +496,14 @@ static int innolux_panel_probe(struct mipi_dsi_device *dsi)
if (err < 0)
return err;
- return mipi_dsi_attach(dsi);
+ err = mipi_dsi_attach(dsi);
+ if (err < 0) {
+ innolux = mipi_dsi_get_drvdata(dsi);
+ innolux_panel_del(innolux);
+ return err;
+ }
+
+ return 0;
}
static int innolux_panel_remove(struct mipi_dsi_device *dsi)
--
2.33.0.685.g46640cef36-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/3] drm/panel: Delete panel on mipi_dsi_attach() failure
2021-09-24 0:33 [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach() Brian Norris
2021-09-24 0:33 ` [PATCH 1/3] drm/panel: kingdisplay-kd097d04: Delete panel on attach() failure Brian Norris
2021-09-24 0:33 ` [PATCH 2/3] drm/panel: innolux-p079zca: " Brian Norris
@ 2021-09-24 0:33 ` Brian Norris
2021-10-14 19:59 ` [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach() Sam Ravnborg
3 siblings, 0 replies; 5+ messages in thread
From: Brian Norris @ 2021-09-24 0:33 UTC (permalink / raw)
To: Sam Ravnborg, Thierry Reding
Cc: linux-kernel, dri-devel, Heiko Stuebner, Sumit Semwal,
Jagan Teki, Brian Norris
Many DSI panel drivers fail to clean up their panel references on
mipi_dsi_attach() failure, so we're leaving a dangling drm_panel
reference to freed memory. Clean that up on failure.
Noticed by inspection, after seeing similar problems on other drivers.
Therefore, I'm not marking Fixes/stable.
Signed-off-by: Brian Norris <briannorris@chromium.org>
---
drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c | 8 +++++++-
drivers/gpu/drm/panel/panel-jdi-lt070me05000.c | 8 +++++++-
drivers/gpu/drm/panel/panel-novatek-nt36672a.c | 8 +++++++-
drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c | 8 +++++++-
drivers/gpu/drm/panel/panel-ronbo-rb070d30.c | 8 +++++++-
drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c | 1 +
drivers/gpu/drm/panel/panel-samsung-sofef00.c | 1 +
drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c | 8 +++++++-
8 files changed, 44 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
index 581661b506f8..f9c1f7bc8218 100644
--- a/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
+++ b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
@@ -227,7 +227,13 @@ static int feiyang_dsi_probe(struct mipi_dsi_device *dsi)
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->lanes = 4;
- return mipi_dsi_attach(dsi);
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ drm_panel_remove(&ctx->panel);
+ return ret;
+ }
+
+ return 0;
}
static int feiyang_dsi_remove(struct mipi_dsi_device *dsi)
diff --git a/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
index 733010b5e4f5..3c86ad262d5e 100644
--- a/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
+++ b/drivers/gpu/drm/panel/panel-jdi-lt070me05000.c
@@ -473,7 +473,13 @@ static int jdi_panel_probe(struct mipi_dsi_device *dsi)
if (ret < 0)
return ret;
- return mipi_dsi_attach(dsi);
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ jdi_panel_del(jdi);
+ return ret;
+ }
+
+ return 0;
}
static int jdi_panel_remove(struct mipi_dsi_device *dsi)
diff --git a/drivers/gpu/drm/panel/panel-novatek-nt36672a.c b/drivers/gpu/drm/panel/panel-novatek-nt36672a.c
index 533cd3934b8b..839b263fb3c0 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt36672a.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt36672a.c
@@ -656,7 +656,13 @@ static int nt36672a_panel_probe(struct mipi_dsi_device *dsi)
if (err < 0)
return err;
- return mipi_dsi_attach(dsi);
+ err = mipi_dsi_attach(dsi);
+ if (err < 0) {
+ drm_panel_remove(&pinfo->base);
+ return err;
+ }
+
+ return 0;
}
static int nt36672a_panel_remove(struct mipi_dsi_device *dsi)
diff --git a/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c b/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
index 3c20beeb1781..3991f5d950af 100644
--- a/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
+++ b/drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c
@@ -241,7 +241,13 @@ static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
if (ret < 0)
return ret;
- return mipi_dsi_attach(dsi);
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ wuxga_nt_panel_del(wuxga_nt);
+ return ret;
+ }
+
+ return 0;
}
static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
diff --git a/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c b/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
index a3782830ae3c..1fb579a574d9 100644
--- a/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
+++ b/drivers/gpu/drm/panel/panel-ronbo-rb070d30.c
@@ -199,7 +199,13 @@ static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->lanes = 4;
- return mipi_dsi_attach(dsi);
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ drm_panel_remove(&ctx->panel);
+ return ret;
+ }
+
+ return 0;
}
static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
index ea63799ff2a1..29fde3823212 100644
--- a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
@@ -247,6 +247,7 @@ static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+ drm_panel_remove(&ctx->panel);
return ret;
}
diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef00.c b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
index 8cb1853574bb..6d107e14fcc5 100644
--- a/drivers/gpu/drm/panel/panel-samsung-sofef00.c
+++ b/drivers/gpu/drm/panel/panel-samsung-sofef00.c
@@ -302,6 +302,7 @@ static int sofef00_panel_probe(struct mipi_dsi_device *dsi)
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+ drm_panel_remove(&ctx->panel);
return ret;
}
diff --git a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
index b937e24dac8e..25829a0a8e80 100644
--- a/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
+++ b/drivers/gpu/drm/panel/panel-sharp-ls043t1le01.c
@@ -296,7 +296,13 @@ static int sharp_nt_panel_probe(struct mipi_dsi_device *dsi)
if (ret < 0)
return ret;
- return mipi_dsi_attach(dsi);
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ sharp_nt_panel_del(sharp_nt);
+ return ret;
+ }
+
+ return 0;
}
static int sharp_nt_panel_remove(struct mipi_dsi_device *dsi)
--
2.33.0.685.g46640cef36-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach()
2021-09-24 0:33 [PATCH 0/3] drm/panel: Proper cleanup after mipi_dsi_attach() Brian Norris
` (2 preceding siblings ...)
2021-09-24 0:33 ` [PATCH 3/3] drm/panel: Delete panel on mipi_dsi_attach() failure Brian Norris
@ 2021-10-14 19:59 ` Sam Ravnborg
3 siblings, 0 replies; 5+ messages in thread
From: Sam Ravnborg @ 2021-10-14 19:59 UTC (permalink / raw)
To: Brian Norris
Cc: Thierry Reding, linux-kernel, dri-devel, Heiko Stuebner,
Sumit Semwal, Jagan Teki
Hi Brian,
On Thu, Sep 23, 2021 at 05:33:52PM -0700, Brian Norris wrote:
> I've tested a few dual-DSI panel drivers which choke if they PROBE_DEFER
> at the wrong time, so I patched those up in patch 1 and 2. Patch 3 fixes
> the other drivers that I couldn't test, but seem to have all the same
> problem.
>
>
> Brian Norris (3):
> drm/panel: kingdisplay-kd097d04: Delete panel on attach() failure
> drm/panel: innolux-p079zca: Delete panel on attach() failure
> drm/panel: Delete panel on mipi_dsi_attach() failure
Thanks for fixing these up, and especially for the fix of the remaining
panel drivers.
I have applied all three patches to drm-misc-next as I did not consider
the fixes urgent.
They will show up in -next in 1-2 weeks.
Sam
^ permalink raw reply [flat|nested] 5+ messages in thread