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Message-Id: <20210712060943.083389971@linuxfoundation.org>
Date: Mon, 12 Jul 2021 08:03:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Jonathan Cameron <Jonathan.Cameron@...wei.com>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 127/700] media: sh_vou: fix pm_runtime_get_sync() usage count
From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
[ Upstream commit 6e8b1526db164c9d4b9dacfb9bc48e365d7c4860 ]
The pm_runtime_get_sync() internally increments the
dev->power.usage_count without decrementing it, even on errors.
Replace it by the new pm_runtime_resume_and_get(), introduced by:
commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
in order to properly decrement the usage counter, avoiding
a potential PM usage counter leak.
While here, check if the PM runtime error was caught at open time.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/media/platform/sh_vou.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/media/platform/sh_vou.c b/drivers/media/platform/sh_vou.c
index 4ac48441f22c..ca4310e26c49 100644
--- a/drivers/media/platform/sh_vou.c
+++ b/drivers/media/platform/sh_vou.c
@@ -1133,7 +1133,11 @@ static int sh_vou_open(struct file *file)
if (v4l2_fh_is_singular_file(file) &&
vou_dev->status == SH_VOU_INITIALISING) {
/* First open */
- pm_runtime_get_sync(vou_dev->v4l2_dev.dev);
+ err = pm_runtime_resume_and_get(vou_dev->v4l2_dev.dev);
+ if (err < 0) {
+ v4l2_fh_release(file);
+ goto done_open;
+ }
err = sh_vou_hw_init(vou_dev);
if (err < 0) {
pm_runtime_put(vou_dev->v4l2_dev.dev);
--
2.30.2
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