Re: [PATCH 19/25] media: s5p-jpeg: fix pm_runtime_get_sync() usage count

[Jonathan Cameron <Jonathan.Cameron@Huawei.com>]

On Wed, 5 May 2021 11:42:09 +0200
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> wrote:

> The pm_runtime_get_sync() internally increments the
> dev->power.usage_count without decrementing it, even on errors.
> Replace it by the new pm_runtime_resume_and_get(), introduced by:
> commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> in order to properly decrement the usage counter, avoiding
> a potential PM usage counter leak.
> 
> As a plus, pm_runtime_resume_and_get() doesn't return
> positive numbers, so the return code validation can
> be removed.
> 
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
> Acked-by: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  drivers/media/platform/s5p-jpeg/jpeg-core.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> index 026111505f5a..d402e456f27d 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> @@ -2566,11 +2566,8 @@ static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
>  static int s5p_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
>  {
>  	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(q);
> -	int ret;
>  
> -	ret = pm_runtime_get_sync(ctx->jpeg->dev);
> -
> -	return ret > 0 ? 0 : ret;
> +	return pm_runtime_resume_and_get(ctx->jpeg->dev);
>  }
>  
>  static void s5p_jpeg_stop_streaming(struct vb2_queue *q)