[PATCH] drm/lima: fix reference leak in lima_pm_busy

[Qiang Yu]

Thanks, applied to drm-misc-next.

Regards,
Qiang

On Fri, Nov 27, 2020 at 5:42 PM Qinglang Miao <miaoqinglang at huawei.com> wrote:
>
> pm_runtime_get_sync will increment pm usage counter even it
> failed. Forgetting to putting operation will result in a
> reference leak here.
>
> A new function pm_runtime_resume_and_get is introduced in
> [0] to keep usage counter balanced. So We fix the reference
> leak by replacing it with new funtion.
>
> [0] dd8088d5a896 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")
>
> Fixes: 50de2e9ebbc0 ("drm/lima: enable runtime pm")
> Reported-by: Hulk Robot <hulkci at huawei.com>
> Signed-off-by: Qinglang Miao <miaoqinglang at huawei.com>
> ---
>  drivers/gpu/drm/lima/lima_sched.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
> index dc6df9e9a..f6e7a88a5 100644
> --- a/drivers/gpu/drm/lima/lima_sched.c
> +++ b/drivers/gpu/drm/lima/lima_sched.c
> @@ -200,7 +200,7 @@ static int lima_pm_busy(struct lima_device *ldev)
>         int ret;
>
>         /* resume GPU if it has been suspended by runtime PM */
> -       ret = pm_runtime_get_sync(ldev->dev);
> +       ret = pm_runtime_resume_and_get(ldev->dev);
>         if (ret < 0)
>                 return ret;
>
> --
> 2.23.0
>