答复: [PATCH -next] media: cedrus: fix reference leak in cedrus_start_streaming

[zhangqilong <zhangqilong3@huawei.com>]

> On 02/11/2020 15:18, Maxime Ripard wrote:
> > On Mon, Nov 02, 2020 at 10:26:22PM +0800, Zhang Qilong wrote:
> >> pm_runtime_get_sync will increment pm usage counter even it failed.
> >> Forgetting to pm_runtime_put_noidle will result in reference leak in
> >> cedrus_start_streaming. We should fix it.
> >>
> >> Fixes: d5aecd289babf ("media: cedrus: Implement runtime PM")
> >> Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
> >
> > Shouldn't we fix pm_runtime_get_sync instead then? It seems that most
> > of the callers get this wrong, and that's definitely non-obvious.
> 
> It's been discussed before, but nobody stepped up to address this issue. In the
> end I decided to just accept media patches that fix this in the drivers rather
> than waiting for some mythical future core fix.
> 
> Nor do I think that you can just 'fix' pm_runtime_get_sync, since then you will
> get cases where pm_runtime_put is called once too often.
>

Thanks for your nice comment, if any updates occur about pm_runtime_get_sync, I will pay attention to it.

Thanks, best wish,
Zhang Qilong

> Regards,
> 
> 	Hans
> 
> >
> > Maxime
> >