linux-kernel - Re: [PATCH -next v6] media: staging: atomisp: use list_splice_init in atomisp_compat

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Date:   Thu, 17 Jun 2021 17:22:01 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     mchehab@...nel.org, sakari.ailus@...ux.intel.com,
        gregkh@...uxfoundation.org, kaixuxia@...cent.com,
        gustavoars@...nel.org, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        weiyongjun1@...wei.com, yuehaibing@...wei.com,
        yangjihong1@...wei.com, yukuai3@...wei.com,
        Hulk Robot <hulkci@...wei.com>
Subject: Re: [PATCH -next v6] media: staging: atomisp: use list_splice_init
 in atomisp_compat_css20.c

On Thu, Jun 17, 2021 at 10:09:26PM +0800, Baokun Li wrote:
> 
> Using list_splice_init() instead of entire while-loops
> in atomisp_compat_css20.c.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Baokun Li <libaokun1@...wei.com>
> ---
> V1->V2:
>         CC mailist
> V2->V3:
>         Using list_move_tail() -> Using list_splice_init()
> V3->V4:
>         Remove redundant 'asd->'
> V4->V5:
>         Add the version information for 'V3->V4:'
> V5->V6:
>         Remove unused variable 'md_buf','dis_buf','s3a_buf'
> 
>  .../media/atomisp/pci/atomisp_compat_css20.c  | 38 +++----------------
>  1 file changed, 5 insertions(+), 33 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
> index f60198bb8a1a..99a632f33d2d 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
> +++ b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
> @@ -2102,9 +2102,6 @@ void atomisp_css_stop(struct atomisp_sub_device *asd,
>  		      enum ia_css_pipe_id pipe_id, bool in_reset)
>  {
>  	struct atomisp_device *isp = asd->isp;
> -	struct atomisp_s3a_buf *s3a_buf;
> -	struct atomisp_dis_buf *dis_buf;
> -	struct atomisp_metadata_buf *md_buf;
>  	unsigned long irqflags;
>  	unsigned int i;
>  
> @@ -2144,42 +2141,17 @@ void atomisp_css_stop(struct atomisp_sub_device *asd,
>  	}
>  
>  	/* move stats buffers to free queue list */
> -	while (!list_empty(&asd->s3a_stats_in_css)) {
> -		s3a_buf = list_entry(asd->s3a_stats_in_css.next,
> -				     struct atomisp_s3a_buf, list);
> -		list_del(&s3a_buf->list);
> -		list_add_tail(&s3a_buf->list, &asd->s3a_stats);
> -	}
> -	while (!list_empty(&asd->s3a_stats_ready)) {
> -		s3a_buf = list_entry(asd->s3a_stats_ready.next,
> -				     struct atomisp_s3a_buf, list);
> -		list_del(&s3a_buf->list);
> -		list_add_tail(&s3a_buf->list, &asd->s3a_stats);
> -	}
> +	list_splice_init(&asd->s3a_stats_in_css, &asd->s3a_stats);
> +	list_splice_init(&asd->s3a_stats_ready, &asd->s3a_stats);
>  
>  	spin_lock_irqsave(&asd->dis_stats_lock, irqflags);
> -	while (!list_empty(&asd->dis_stats_in_css)) {
> -		dis_buf = list_entry(asd->dis_stats_in_css.next,
> -				     struct atomisp_dis_buf, list);
> -		list_del(&dis_buf->list);
> -		list_add_tail(&dis_buf->list, &asd->dis_stats);
> -	}
> +	list_splice_init(&asd->dis_stats_in_css, &asd->dis_stats);
>  	asd->params.dis_proj_data_valid = false;
>  	spin_unlock_irqrestore(&asd->dis_stats_lock, irqflags);
>  
>  	for (i = 0; i < ATOMISP_METADATA_TYPE_NUM; i++) {
> -		while (!list_empty(&asd->metadata_in_css[i])) {
> -			md_buf = list_entry(asd->metadata_in_css[i].next,
> -					    struct atomisp_metadata_buf, list);
> -			list_del(&md_buf->list);
> -			list_add_tail(&md_buf->list, &asd->metadata[i]);
> -		}
> -		while (!list_empty(&asd->metadata_ready[i])) {
> -			md_buf = list_entry(asd->metadata_ready[i].next,
> -					    struct atomisp_metadata_buf, list);
> -			list_del(&md_buf->list);
> -			list_add_tail(&md_buf->list, &asd->metadata[i]);
> -		}
> +		list_splice_init(&asd->metadata_in_css[i], &asd->metadata[i]);
> +		list_splice_init(&asd->metadata_ready[i], &asd->metadata[i]);
>  	}
>  
>  	atomisp_flush_params_queue(&asd->video_out_capture);
> -- 
> 2.31.1
> 

-- 
With Best Regards,
Andy Shevchenko