> Hi Dinghao,
>
> On 6/24/20 9:30 AM, Dinghao Liu wrote:
> > pm_runtime_get_sync() increments the runtime PM usage counter even
> > when it returns an error code. Thus a pairing decrement is needed on
> > the error handling path to keep the counter balanced. For other error
> > paths after this call, things are the same.
> >
> > Signed-off-by: Dinghao Liu <dinghao....@zju.edu.cn>
> > ---
> >
> > Changelog:
> >
> > v2: - Add pm_runtime_get_noresume() on failure of
> > pm_runtime_put_sync() to balance PM counter instead of
> > releasing everything here.
>
> You are adding pm_runtime_get_noresume in pm_runtime_put_sync error path
> but the patch description is referring to pm_runtime_get_sync. I'm confused.
>
When pm_runtime_put_sync failed, the control flow will jump to
err_dev_unregister, where has already been a pm_runtime_put_noidle.
If we don't add an extra pm_runtime_get_noresume here, we will
decrease PM usage counter twice.
Anyway, this may seem a little strange. Do you have a better
strategy to reorder the labels?
Regards,
Dinghao
> > ---
> > drivers/media/platform/qcom/venus/core.c | 5 ++++-
> > 1 file changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/platform/qcom/venus/core.c
> > b/drivers/media/platform/qcom/venus/core.c
> > index 203c6538044f..b0b932bf8c02 100644
> > --- a/drivers/media/platform/qcom/venus/core.c
> > +++ b/drivers/media/platform/qcom/venus/core.c
> > @@ -287,8 +287,10 @@ static int venus_probe(struct platform_device *pdev)
> > goto err_core_deinit;
> >
> > ret = pm_runtime_put_sync(dev);
> > - if (ret)
> > + if (ret) {
> > + pm_runtime_get_noresume(dev);
> > goto err_dev_unregister;
> > + }
> >
> > return 0;
> >
> > @@ -299,6 +301,7 @@ static int venus_probe(struct platform_device *pdev)
> > err_venus_shutdown:
> > venus_shutdown(core);
> > err_runtime_disable:
> > + pm_runtime_put_noidle(dev);
> > pm_runtime_set_suspended(dev);
> > pm_runtime_disable(dev);
> > hfi_destroy(core);
> >
>
> --
> regards,
> Stan
