This is a note to let you know that I've just added the patch titled
drm/bridge: cdns: Fix PM reference leak in cdns_dsi_transfer()
to the 5.4-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-bridge-cdns-fix-pm-reference-leak-in-cdns_dsi_tr.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b6a632e52333db4f8b356d4c95f676e10e7482a4
Author: Zou Wei <zou_wei@xxxxxxxxxx>
Date: Mon May 24 15:21:02 2021 +0800
drm/bridge: cdns: Fix PM reference leak in cdns_dsi_transfer()
[ Upstream commit 33f90f27e1c5ccd648d3e78a1c28be9ee8791cf1 ]
pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.
Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Zou Wei <zou_wei@xxxxxxxxxx>
Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
Signed-off-by: Robert Foss <robert.foss@xxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/1621840862-106024-1-git-send-email-zou_wei@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
index 6166dca6be81..0cb9dd6986ec 100644
--- a/drivers/gpu/drm/bridge/cdns-dsi.c
+++ b/drivers/gpu/drm/bridge/cdns-dsi.c
@@ -1026,7 +1026,7 @@ static ssize_t cdns_dsi_transfer(struct mipi_dsi_host *host,
struct mipi_dsi_packet packet;
int ret, i, tx_len, rx_len;
- ret = pm_runtime_get_sync(host->dev);
+ ret = pm_runtime_resume_and_get(host->dev);
if (ret < 0)
return ret;
