[PATCH v2 0/2] mxsfb fixes

[PATCH v2 0/2] mxsfb fixes

[Alexander Stein]

This v2 collects both single patches from [1] and [2].

Changes in v2:
* Added Reviewed-by: Marek Vasut <marex@denx.de> to patch 1
* Updated commit message of patch 2 as suggested by Marek

[1] https://patchwork.kernel.org/project/linux-arm-kernel/patch/20220121095644.329256-1-alexander.stein@ew.tq-group.com/
[2] https://patchwork.kernel.org/project/linux-arm-kernel/patch/20220121131238.507567-1-alexander.stein@ew.tq-group.com/

Alexander Stein (2):
  drm: mxsfb: Use dev_err_probe() helper
  drm: mxsfb: Fix NULL pointer dereference

 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +--
 drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 +++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

-- 
2.25.1


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[PATCH v2 1/2] drm: mxsfb: Use dev_err_probe() helper

[Alexander Stein]

Use the dev_err_probe() helper, instead of open-coding the same
operation. This also adds a nice hint in
/sys/kernel/debug/devices_deferred.

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
 drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 375f26d4a417..c4da358f2154 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -258,8 +258,7 @@ static int mxsfb_load(struct drm_device *drm,
 
 	ret = mxsfb_attach_bridge(mxsfb);
 	if (ret) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
+		dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
 		goto err_vblank;
 	}
 
-- 
2.25.1


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Re: [PATCH v2 1/2] drm: mxsfb: Use dev_err_probe() helper

[Marek Vasut]

On 2/2/22 09:17, Alexander Stein wrote:
> Use the dev_err_probe() helper, instead of open-coding the same
> operation. This also adds a nice hint in
> /sys/kernel/debug/devices_deferred.
> 
> Reviewed-by: Marek Vasut <marex@denx.de>
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> ---
>   drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)

V2: ... what changed ... ?

(probably nothing, since the patch still looks fine)

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Re: (EXT) Re: [PATCH v2 1/2] drm: mxsfb: Use dev_err_probe() helper

[Alexander Stein]

Am Mittwoch, 2. Februar 2022, 09:29:20 CET schrieb Marek Vasut:
> On 2/2/22 09:17, Alexander Stein wrote:
> > Use the dev_err_probe() helper, instead of open-coding the same
> > operation. This also adds a nice hint in
> > /sys/kernel/debug/devices_deferred.
> > 
> > Reviewed-by: Marek Vasut <marex@denx.de>
> > Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> > ---
> > 
> >   drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +--
> >   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> V2: ... what changed ... ?
> 
> (probably nothing, since the patch still looks fine)

I put the changelog into cover letter (0/2). Content hasn't changed, I just 
added your Reviewed-by.

Regards,
Alexander




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Re: (EXT) Re: [PATCH v2 1/2] drm: mxsfb: Use dev_err_probe() helper

[Marek Vasut]

On 2/2/22 09:58, Alexander Stein wrote:
> Am Mittwoch, 2. Februar 2022, 09:29:20 CET schrieb Marek Vasut:
>> On 2/2/22 09:17, Alexander Stein wrote:
>>> Use the dev_err_probe() helper, instead of open-coding the same
>>> operation. This also adds a nice hint in
>>> /sys/kernel/debug/devices_deferred.
>>>
>>> Reviewed-by: Marek Vasut <marex@denx.de>
>>> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>> ---
>>>
>>>    drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +--
>>>    1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> V2: ... what changed ... ?
>>
>> (probably nothing, since the patch still looks fine)
> 
> I put the changelog into cover letter (0/2). Content hasn't changed, I just
> added your Reviewed-by.

I missed it in the cover letter, got it.

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Re: (EXT) Re: [PATCH v2 1/2] drm: mxsfb: Use dev_err_probe() helper

[Marek Vasut]

On 2/2/22 10:03, Marek Vasut wrote:
> On 2/2/22 09:58, Alexander Stein wrote:
>> Am Mittwoch, 2. Februar 2022, 09:29:20 CET schrieb Marek Vasut:
>>> On 2/2/22 09:17, Alexander Stein wrote:
>>>> Use the dev_err_probe() helper, instead of open-coding the same
>>>> operation. This also adds a nice hint in
>>>> /sys/kernel/debug/devices_deferred.
>>>>
>>>> Reviewed-by: Marek Vasut <marex@denx.de>
>>>> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
>>>> ---
>>>>
>>>>    drivers/gpu/drm/mxsfb/mxsfb_drv.c | 3 +--
>>>>    1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> V2: ... what changed ... ?
>>>
>>> (probably nothing, since the patch still looks fine)
>>
>> I put the changelog into cover letter (0/2). Content hasn't changed, I 
>> just
>> added your Reviewed-by.
> 
> I missed it in the cover letter, got it.


Applied to drm-misc/drm-misc-next , thanks.

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[PATCH v2 2/2] drm: mxsfb: Fix NULL pointer dereference

[Alexander Stein]

mxsfb should not never dereference the NULL pointer which
drm_atomic_get_new_bridge_state is allowed to return.
Assume a fixed format instead.

Fixes: commit b776b0f00f24 ("drm: mxsfb: Use bus_format from the nearest bridge if present")
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
 drivers/gpu/drm/mxsfb/mxsfb_kms.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
index 0655582ae8ed..4cfb6c001679 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
@@ -361,7 +361,11 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
 		bridge_state =
 			drm_atomic_get_new_bridge_state(state,
 							mxsfb->bridge);
-		bus_format = bridge_state->input_bus_cfg.format;
+		if (!bridge_state)
+			bus_format = MEDIA_BUS_FMT_FIXED;
+		else
+			bus_format = bridge_state->input_bus_cfg.format;
+
 		if (bus_format == MEDIA_BUS_FMT_FIXED) {
 			dev_warn_once(drm->dev,
 				      "Bridge does not provide bus format, assuming MEDIA_BUS_FMT_RGB888_1X24.\n"
-- 
2.25.1


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Re: [PATCH v2 2/2] drm: mxsfb: Fix NULL pointer dereference

[Marek Vasut]

On 2/2/22 09:17, Alexander Stein wrote:
> mxsfb should not never dereference the NULL pointer which

... not ever ... but that's really a nitpick.

> drm_atomic_get_new_bridge_state is allowed to return.
> Assume a fixed format instead.
> 
> Fixes: commit b776b0f00f24 ("drm: mxsfb: Use bus_format from the nearest bridge if present")
> Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>

It's perfect otherwise, thanks !

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Re: (EXT) Re: [PATCH v2 2/2] drm: mxsfb: Fix NULL pointer dereference

[Alexander Stein]

Am Mittwoch, 2. Februar 2022, 09:30:38 CET schrieb Marek Vasut:
> On 2/2/22 09:17, Alexander Stein wrote:
> > mxsfb should not never dereference the NULL pointer which
> 
> ... not ever ... but that's really a nitpick.

Doh, I just copied it from my mail...
You want me to send a v2.1? Or will someone fix it when applying?

> > drm_atomic_get_new_bridge_state is allowed to return.
> > Assume a fixed format instead.
> > 
> > Fixes: commit b776b0f00f24 ("drm: mxsfb: Use bus_format from the nearest
> > bridge if present") Signed-off-by: Alexander Stein
> > <alexander.stein@ew.tq-group.com>
> 
> It's perfect otherwise, thanks !

Thanks,
Alexander




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Re: (EXT) Re: [PATCH v2 2/2] drm: mxsfb: Fix NULL pointer dereference

[Marek Vasut]

On 2/2/22 10:00, Alexander Stein wrote:
> Am Mittwoch, 2. Februar 2022, 09:30:38 CET schrieb Marek Vasut:
>> On 2/2/22 09:17, Alexander Stein wrote:
>>> mxsfb should not never dereference the NULL pointer which
>>
>> ... not ever ... but that's really a nitpick.
> 
> Doh, I just copied it from my mail...
> You want me to send a v2.1? Or will someone fix it when applying?

I think it can be fixed when applying, no worries.

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Re: (EXT) Re: [PATCH v2 2/2] drm: mxsfb: Fix NULL pointer dereference

[Marek Vasut]

On 2/2/22 10:03, Marek Vasut wrote:
> On 2/2/22 10:00, Alexander Stein wrote:
>> Am Mittwoch, 2. Februar 2022, 09:30:38 CET schrieb Marek Vasut:
>>> On 2/2/22 09:17, Alexander Stein wrote:
>>>> mxsfb should not never dereference the NULL pointer which
>>>
>>> ... not ever ... but that's really a nitpick.
>>
>> Doh, I just copied it from my mail...
>> You want me to send a v2.1? Or will someone fix it when applying?
> 
> I think it can be fixed when applying, no worries.

Applied to drm-misc/drm-misc-fixes , thanks.

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