linux-kernel - Re: [PATCH v3 17/79] media: s5p-jpeg: fix pm_runtime_get

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Date:   Tue, 27 Apr 2021 14:36:01 +0200
From:   Andrzej Pietrasiewicz <andrzejtp2010@...il.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v3 17/79] media: s5p-jpeg: fix pm_runtime_get_sync() usage
 count

Hi Mauro,

Thanks for the patch.

W dniu 27.04.2021 o 12:26, Mauro Carvalho Chehab pisze:
> 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 and avoid memory
> leaks.
> 
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

Acked-by: Andrzej Pietrasiewicz <andrzejtp2010@...il.com>

> ---
>   drivers/media/platform/s5p-jpeg/jpeg-core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> index 026111505f5a..c4f19418a460 100644
> --- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
> +++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
> @@ -2568,7 +2568,7 @@ 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);
> +	ret = pm_runtime_resume_and_get(ctx->jpeg->dev);
>   
>   	return ret > 0 ? 0 : ret;
>   }
>