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media: hi846: fix usage of pm_runtime_get_if_in_use() 

pm_runtime_get_if_in_use() does not only return nonzero values when
the device is in use, it can return a negative errno too.

And especially during resuming from system suspend, when runtime pm
is not yet up again, -EAGAIN is being returned, so the subsequent
pm_runtime_put() call results in a refcount underflow.

Fix system-resume by handling -EAGAIN of pm_runtime_get_if_in_use().

Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Fixes: e8c0882685 ("media: i2c: add driver for the SK Hynix Hi-846 8M pixel camera")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
This commit is contained in:
Martin Kepplinger 2023-04-25 11:47:47 +02:00 committed by Hans Verkuil
parent e103484c76
commit 04fc06f6dc
1 changed files with 2 additions and 1 deletions
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3
drivers/media/i2c/hi846.c
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@ -1353,7 +1353,8 @@ static int hi846_set_ctrl(struct v4l2_ctrl *ctrl)
exposure_max);
}
if (!pm_runtime_get_if_in_use(&client->dev))
ret = pm_runtime_get_if_in_use(&client->dev);
if (!ret || ret == -EAGAIN)
return 0;
switch (ctrl->id) {