stable inclusion
from stable-v5.10.121
commit 883f1d52a57bf51e1d7a80c432345e2c6222477e
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6CQ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=883f1d52a57bf51e1d7a80c432345e2c6222477e

--------------------------------

[ Upstream commit ca75f6f7 ]

There is a possibility for mdp5_get_global_state to return
-EDEADLK when acquiring the modeset lock, but currently global_state in
mdp5_mixer_release doesn't check for if an error is returned.

To avoid a NULL dereference error, let's have mdp5_mixer_release
check if an error is returned and propagate that error.
Reported-by: NTomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: NJessica Zhang <quic_jesszhan@quicinc.com>
Fixes: 7907a0d7 ("drm/msm/mdp5: Use the new private_obj state")
Reviewed-by: NRob Clark <robdclark@gmail.com>
Reviewed-by: NDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/485181/
Link: https://lore.kernel.org/r/20220505214051.155-2-quic_jesszhan@quicinc.comSigned-off-by: NDmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>