linux-kernel - Re: [PATCH] media: platform: sti: Fix rumtime PM imbalance in regs

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Date:   Wed, 7 Apr 2021 15:58:38 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     Fabien Dessenne <fabien.dessenne@...s.st.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: platform: sti: Fix rumtime PM imbalance in
 regs_show

On 07/04/2021 07:43, Dinghao Liu wrote:
> pm_runtime_get_sync() will increase the rumtime PM counter
> even it returns an error. Thus a pairing decrement is needed
> to prevent refcount leak. Fix this by replacing this API with
> pm_runtime_resume_and_get(), which will not change the runtime
> PM counter on error.

Nice that a new function was created for this. Good news.

Just a heads up: if you make more patches like this, make sure you
fix the typo 'rumtime' to 'runtime'. I'll fix it manually, no need
to repost. And 'rumtime' does sound tasty!

Regards,

	Hans

> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/media/platform/sti/bdisp/bdisp-debug.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/sti/bdisp/bdisp-debug.c b/drivers/media/platform/sti/bdisp/bdisp-debug.c
> index 2b270093009c..a27f638df11c 100644
> --- a/drivers/media/platform/sti/bdisp/bdisp-debug.c
> +++ b/drivers/media/platform/sti/bdisp/bdisp-debug.c
> @@ -480,7 +480,7 @@ static int regs_show(struct seq_file *s, void *data)
>  	int ret;
>  	unsigned int i;
>  
> -	ret = pm_runtime_get_sync(bdisp->dev);
> +	ret = pm_runtime_resume_and_get(bdisp->dev);
>  	if (ret < 0) {
>  		seq_puts(s, "Cannot wake up IP\n");
>  		return 0;
>