Hi Dinghao, thank you for the patch! The first part is fine, but I think the second part is not necessary, see below: On Sat, May 23, 2020 at 06:03:32PM +0800, Dinghao Liu wrote: > When coda_firmware_request() returns an error code, > a pairing runtime PM usage counter decrement is needed > to keep the counter balanced. > > Also, the caller expects coda_probe() to increase PM > usage counter, there should be a refcount decrement > in coda_remove() to keep the counter balanced. coda_probe() increments the usage counter only until coda_fw_callback() decrements it again. Where is the imbalance? > Signed-off-by: Dinghao Liu <dinghao.liu@xxxxxxxxxx> > --- > drivers/media/platform/coda/coda-common.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c > index d0d093dd8f7c..550e9a1266da 100644 > --- a/drivers/media/platform/coda/coda-common.c > +++ b/drivers/media/platform/coda/coda-common.c > @@ -3119,6 +3119,8 @@ static int coda_probe(struct platform_device *pdev) > return 0; > > err_alloc_workqueue: > + pm_runtime_disable(&pdev->dev); > + pm_runtime_put_noidle(&pdev->dev); These seem right, they balance out the pm_runtime_enable() and pm_runtime_get_noresume() right before the error. > destroy_workqueue(dev->workqueue); > err_v4l2_register: > v4l2_device_unregister(&dev->v4l2_dev); > @@ -3136,6 +3138,7 @@ static int coda_remove(struct platform_device *pdev) > } > if (dev->m2m_dev) > v4l2_m2m_release(dev->m2m_dev); > + pm_runtime_put_noidle(&pdev->dev); I think this is incorrect. There is one pm_runtime_get_noresume() in coda_probe(), and one pm_runtime_put_sync() in coda_fw_callback(). By the time coda_remove() is called, balance is already restored. regards Philipp
