linux-kernel - [PATCH 12/14] [media] saa7146: drop double zeroing

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Date:   Sun, 20 Sep 2020 13:26:24 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     kernel-janitors@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 12/14] [media] saa7146: drop double zeroing

sg_init_table zeroes its first argument, so the allocation of that argument
doesn't have to.

the semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x,n,flags;
@@

x = 
- kcalloc
+ kmalloc_array
  (n,sizeof(struct scatterlist),flags)
...
sg_init_table(x,n)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 drivers/media/common/saa7146/saa7146_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/media/common/saa7146/saa7146_core.c b/drivers/media/common/saa7146/saa7146_core.c
--- a/drivers/media/common/saa7146/saa7146_core.c
+++ b/drivers/media/common/saa7146/saa7146_core.c
@@ -140,7 +140,7 @@ static struct scatterlist* vmalloc_to_sg
 	struct page *pg;
 	int i;
 
-	sglist = kcalloc(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
+	sglist = kmalloc_array(nr_pages, sizeof(struct scatterlist), GFP_KERNEL);
 	if (NULL == sglist)
 		return NULL;
 	sg_init_table(sglist, nr_pages);