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drm/msm/mdp5: Return error code in mdp5_mixer_release when deadlock is detected

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[ Upstream commit ca75f6f7c6 ]

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: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Fixes: 7907a0d77c ("drm/msm/mdp5: Use the new private_obj state")
Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/485181/
Link: https://lore.kernel.org/r/20220505214051.155-2-quic_jesszhan@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jessica Zhang 2022-05-05 14:40:51 -07:00 committed by Greg Kroah-Hartman
parent 19964dfb39
commit 47e3930610
3 changed files with 21 additions and 8 deletions
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10
drivers/gpu/drm/msm/disp/mdp5/mdp5_crtc.c
View file

@ -612,9 +612,15 @@ static int mdp5_crtc_setup_pipeline(struct drm_crtc *crtc,
if (ret)
return ret;
mdp5_mixer_release(new_crtc_state->state, old_mixer);
ret = mdp5_mixer_release(new_crtc_state->state, old_mixer);
if (ret)
return ret;
if (old_r_mixer) {
mdp5_mixer_release(new_crtc_state->state, old_r_mixer);
ret = mdp5_mixer_release(new_crtc_state->state, old_r_mixer);
if (ret)
return ret;
if (!need_right_mixer)
pipeline->r_mixer = NULL;
}

15
drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.c
View file

@ -116,21 +116,28 @@ int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
return 0;
}
void mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
int mdp5_mixer_release(struct drm_atomic_state *s, struct mdp5_hw_mixer *mixer)
{
struct mdp5_global_state *global_state = mdp5_get_global_state(s);
struct mdp5_hw_mixer_state *new_state = &global_state->hwmixer;
struct mdp5_hw_mixer_state *new_state;
if (!mixer)
return;
return 0;
if (IS_ERR(global_state))
return PTR_ERR(global_state);
new_state = &global_state->hwmixer;
if (WARN_ON(!new_state->hwmixer_to_crtc[mixer->idx]))
return;
return -EINVAL;
DBG("%s: release from crtc %s", mixer->name,
new_state->hwmixer_to_crtc[mixer->idx]->name);
new_state->hwmixer_to_crtc[mixer->idx] = NULL;
return 0;
}
void mdp5_mixer_destroy(struct mdp5_hw_mixer *mixer)

4
drivers/gpu/drm/msm/disp/mdp5/mdp5_mixer.h
View file

@ -30,7 +30,7 @@ void mdp5_mixer_destroy(struct mdp5_hw_mixer *lm);
int mdp5_mixer_assign(struct drm_atomic_state *s, struct drm_crtc *crtc,
uint32_t caps, struct mdp5_hw_mixer **mixer,
struct mdp5_hw_mixer **r_mixer);
void mdp5_mixer_release(struct drm_atomic_state *s,
struct mdp5_hw_mixer *mixer);
int mdp5_mixer_release(struct drm_atomic_state *s,
struct mdp5_hw_mixer *mixer);
#endif /* __MDP5_LM_H__ */