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

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Date:   Thu, 17 Jun 2021 22:09:26 +0800
From:   Baokun Li <libaokun1@...wei.com>
To:     <libaokun1@...wei.com>, <mchehab@...nel.org>,
        <sakari.ailus@...ux.intel.com>, <gregkh@...uxfoundation.org>,
        <andriy.shevchenko@...ux.intel.com>, <kaixuxia@...cent.com>,
        <gustavoars@...nel.org>, <linux-media@...r.kernel.org>,
        <linux-staging@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
CC:     <weiyongjun1@...wei.com>, <yuehaibing@...wei.com>,
        <yangjihong1@...wei.com>, <yukuai3@...wei.com>,
        Hulk Robot <hulkci@...wei.com>
Subject: [PATCH -next v6] media: staging: atomisp: use list_splice_init in atomisp_compat_css20.c


Using list_splice_init() instead of entire while-loops
in atomisp_compat_css20.c.

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