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[v2,12/79] media: renesas-ceu: Properly check for PM errors

Message ID 442ba0816c3977dddf01212659443ee13f90bd5d.1619518193.git.mchehab+huawei@kernel.org
State Superseded
Headers show
Series None | expand

Commit Message

Mauro Carvalho Chehab April 27, 2021, 10:12 a.m. UTC 
Right now, the driver just assumes that PM runtime resume
worked, but it may fail.

Well, the pm_runtime_get_sync() internally increments the
dev->power.usage_count without decrementing it, even on errors.

So, using it is tricky. Let's 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")
and return an error if something bad happens.

This should ensure that the PM runtime usage_count will be
properly decremented if an error happens at open time.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 drivers/media/platform/renesas-ceu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/media/platform/renesas-ceu.c b/drivers/media/platform/renesas-ceu.c
index cd137101d41e..17f01b6e3fe0 100644
--- a/drivers/media/platform/renesas-ceu.c
+++ b/drivers/media/platform/renesas-ceu.c
@@ -1099,10 +1099,10 @@  static int ceu_open(struct file *file)
 
 	mutex_lock(&ceudev->mlock);
 	/* Causes soft-reset and sensor power on on first open */
-	pm_runtime_get_sync(ceudev->dev);
+	ret = pm_runtime_resume_and_get(ceudev->dev);
 	mutex_unlock(&ceudev->mlock);
 
-	return 0;
+	return ret;
 }
 
 static int ceu_release(struct file *file)