6.10-stable review patch. If anyone has any objections, please let me know.
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From: Dmitry Baryshkov dmitry.baryshkov@linaro.org
[ 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@linaro.org Reviewed-by: Abhinav Kumar quic_abhinavk@quicinc.com Reviewed-by: Stephen Boyd swboyd@chromium.org Patchwork: https://patchwork.freedesktop.org/patch/580137/ Link: https://lore.kernel.org/r/20240226223446.4194079-1-dmitry.baryshkov@linaro.o... [quic_abhinavk@quicinc.com: resolved trivial conflict while rebase] Signed-off-by: Abhinav Kumar quic_abhinavk@quicinc.com Signed-off-by: Rob Clark robdclark@chromium.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/msm/dp/dp_aux.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
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);