From: Mauro Carvalho Chehab mchehab+huawei@kernel.org
[ Upstream commit 62c90446868b439929cb04395f04a709a64ae04b ]
The PM runtime get logic is currently broken, as it checks if ret is zero instead of checking if it is an error code, as reported by Dan Carpenter.
While here, use the pm_runtime_resume_and_get() as added by: commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") added pm_runtime_resume_and_get() in order to automatically handle dev->power.usage_count decrement on errors. As a bonus, such function always return zero on success.
It should also be noticed that a fail of pm_runtime_get_sync() would potentially result in a spurious runtime_suspend(), instead of using pm_runtime_put_noidle().
Reported-by: Dan Carpenter dan.carpenter@oracle.com Reviewed-by: Daniele Alessandrelli daniele.alessandrelli@intel.com Reviewed-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/media/i2c/imx334.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/media/i2c/imx334.c b/drivers/media/i2c/imx334.c index 047aa7658d21..23f28606e570 100644 --- a/drivers/media/i2c/imx334.c +++ b/drivers/media/i2c/imx334.c @@ -717,9 +717,9 @@ static int imx334_set_stream(struct v4l2_subdev *sd, int enable) }
if (enable) { - ret = pm_runtime_get_sync(imx334->dev); - if (ret) - goto error_power_off; + ret = pm_runtime_resume_and_get(imx334->dev); + if (ret < 0) + goto error_unlock;
ret = imx334_start_streaming(imx334); if (ret) @@ -737,6 +737,7 @@ static int imx334_set_stream(struct v4l2_subdev *sd, int enable)
error_power_off: pm_runtime_put(imx334->dev); +error_unlock: mutex_unlock(&imx334->mutex);
return ret;