Am Dienstag, dem 16.05.2023 um 16:22 +0300 schrieb Sakari Ailus: > Hi Martin, > > On Tue, Apr 25, 2023 at 11:47:47AM +0200, Martin Kepplinger wrote: > > 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@xxxxxxx> > > --- > > > > revision history > > ---------------- > > v2 (thank you Sakari and Laurent): > > * drop the other patch (the streaming-state in suspend/resume needs > > to > > be solved differently). > > * Sakari pointed out that many drivers are affected by this and > > that > > runtime-pm might need changes instead. I think this patch doesn't > > hurt > > and could serve as a reminder to do so. > > I guess it's appropriate to add: > > Fixes: e8c0882685f9 ("media: i2c: add driver for the SK Hynix Hi-846 > 8M pixel camera") > I agree. Feel free to do so when applying. martin