On 2020-10-20 15:26, Rob Clark wrote:
From: Rob Clark <robdclark@xxxxxxxxxxxx>
lockdep dislikes seeing locks unwound in a non-nested fashion.
Fixes: 37c2016e3608 ("drm/msm: Fix race condition in msm driver with
async layer updates")
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Reviewed-by: Abhinav Kumar <abhinavk@xxxxxxxxxxxxxx>
--- drivers/gpu/drm/msm/msm_atomic.c | 2 +- drivers/gpu/drm/msm/msm_kms.h | 4 ++++ include/drm/drm_crtc.h | 10 ++++++++++ 3 files changed, 15 insertions(+), 1 deletion(-)diff --git a/drivers/gpu/drm/msm/msm_atomic.c b/drivers/gpu/drm/msm/msm_atomic.cindex b03d6ab6b19b..6a326761dc4a 100644 --- a/drivers/gpu/drm/msm/msm_atomic.c +++ b/drivers/gpu/drm/msm/msm_atomic.c @@ -67,7 +67,7 @@ static void unlock_crtcs(struct msm_kms *kms, unsigned int crtc_mask) { struct drm_crtc *crtc; - for_each_crtc_mask(kms->dev, crtc, crtc_mask) + for_each_crtc_mask_reverse(kms->dev, crtc, crtc_mask) mutex_unlock(&kms->commit_lock[drm_crtc_index(crtc)]); }diff --git a/drivers/gpu/drm/msm/msm_kms.h b/drivers/gpu/drm/msm/msm_kms.hindex 8d3e626c9fee..d8151a89e163 100644 --- a/drivers/gpu/drm/msm/msm_kms.h +++ b/drivers/gpu/drm/msm/msm_kms.h @@ -211,4 +211,8 @@ int dpu_mdss_init(struct drm_device *dev); drm_for_each_crtc(crtc, dev) \ for_each_if (drm_crtc_mask(crtc) & (crtc_mask)) +#define for_each_crtc_mask_reverse(dev, crtc, crtc_mask) \ + drm_for_each_crtc_reverse(crtc, dev) \ + for_each_if (drm_crtc_mask(crtc) & (crtc_mask)) + #endif /* __MSM_KMS_H__ */ diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index dfdb04619b0d..25f5958f2882 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1274,4 +1274,14 @@ static inline struct drm_crtc *drm_crtc_find(struct drm_device *dev, #define drm_for_each_crtc(crtc, dev) \ list_for_each_entry(crtc, &(dev)->mode_config.crtc_list, head) +/** + * drm_for_each_crtc_reverse - iterate over all CRTCs in reverse order + * @crtc: a &struct drm_crtc as the loop cursor + * @dev: the &struct drm_device + * + * Iterate over all CRTCs of @dev. + */ +#define drm_for_each_crtc_reverse(crtc, dev) \+ list_for_each_entry_reverse(crtc, &(dev)->mode_config.crtc_list, head)+ #endif /* __DRM_CRTC_H__ */
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