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;