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drm/msm/dp: fix runtime_pm handling in dp_wait_hpd_asserted

Message ID 20240226223446.4194079-1-dmitry.baryshkov@linaro.org
State New
Headers show
Series drm/msm/dp: fix runtime_pm handling in dp_wait_hpd_asserted | expand

Commit Message

Dmitry Baryshkov Feb. 26, 2024, 10:34 p.m. UTC
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@linaro.org>
---
 drivers/gpu/drm/msm/dp/dp_aux.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
index 03f4951c49f4..1a264e7deb90 100644
--- a/drivers/gpu/drm/msm/dp/dp_aux.c
+++ b/drivers/gpu/drm/msm/dp/dp_aux.c
@@ -509,7 +509,10 @@  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);
 	pm_runtime_put_sync(aux->dev);