Warning at drivers/gpu/drm/drm_atomic_helper.c

[Fabio Estevam]

On Sun, Jan 22, 2017 at 12:26 PM, Fabio Estevam <festevam at gmail.com> wrote:
> On Sat, Jan 21, 2017 at 2:40 PM, Fabio Estevam <festevam at gmail.com> wrote:
>> Hi,
>>
>> Stopping kmscube application on mx6q through CTRL + C sometimes leads
>> to the following kernel warning:
>>
>> ^C[ 3939.785516] ------------[ cut here ]------------
>> [ 3939.790313] WARNING: CPU: 1 PID: 67 at
>> drivers/gpu/drm/drm_atomic_helper.c:1032
>> drm_atomic_helper_wait_for_fences+0xe4/0x104
>> [ 3939.801626] Modules linked in:
>> [ 3939.804762] CPU: 1 PID: 67 Comm: kworker/1:1 Tainted: G        W
>>    4.9.4 #1
>
> Just tested 4.9.5 and the kernel warning is gone.

Actually 4.9.5 shows the same warning.

If I change .atomic_commit like in 782ea2a493ba90800 ("drm/imx: Switch
to drm_fb_cma_prepare_fb() helper") from 4.10-rc1

-       .atomic_commit = imx_drm_atomic_commit,
+       .atomic_commit = drm_atomic_helper_commit,

it fixes the problem.