This is a note to let you know that I've just added the patch titled
drm/msm/dp: fix runtime_pm handling in dp_wait_hpd_asserted
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-dp-fix-runtime_pm-handling-in-dp_wait_hpd_as.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit be497a9b70f68cb20812c067d7b7e8d894295dde
Author: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Date: Tue Feb 27 00:34:45 2024 +0200
drm/msm/dp: fix runtime_pm handling in dp_wait_hpd_asserted
[ Upstream commit aeacc39e2088a15ee31c8af4f68c84981fa08eb7 ]
The function dp_wait_hpd_asserted() uses pm_runtime_get_sync() and
doesn't care about the return value. Potentially this can lead to
unclocked access if for some reason resuming of the DP controller fails.
Change the function to use pm_runtime_resume_and_get() and return an
error if resume fails.
Fixes: e2969ee30252 ("drm/msm/dp: move of_dp_aux_populate_bus() to eDP probe()")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Patchwork: https://patchwork.freedesktop.org/patch/580137/
Link: https://lore.kernel.org/r/20240226223446.4194079-1-dmitry.baryshkov@xxxxxxxxxx
[quic_abhinavk@xxxxxxxxxxx: resolved trivial conflict while rebase]
Signed-off-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
index da46a433bf747..00dfafbebe0e5 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -513,7 +513,10 @@ static int dp_wait_hpd_asserted(struct drm_dp_aux *dp_aux,
aux = container_of(dp_aux, struct dp_aux_private, dp_aux);
- pm_runtime_get_sync(aux->dev);
+ ret = pm_runtime_resume_and_get(aux->dev);
+ if (ret)
+ return ret;
+
ret = dp_catalog_aux_wait_for_hpd_connect_state(aux->catalog, wait_us);
pm_runtime_put_sync(aux->dev);
