linux-kernel - [PATCH 04/14] dmaengine: sh: drop double zeroing

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Date:   Sun, 20 Sep 2020 13:26:16 +0200
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     kernel-janitors@...r.kernel.org, Vinod Koul <vkoul@...nel.org>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 04/14] dmaengine: sh: 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(*x),flags)
...
sg_init_table(x,n)
// </smpl>

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

---
 drivers/dma/sh/shdma-base.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -728,7 +728,7 @@ static struct dma_async_tx_descriptor *s
 	 * Allocate the sg list dynamically as it would consumer too much stack
 	 * space.
 	 */
-	sgl = kcalloc(sg_len, sizeof(*sgl), GFP_KERNEL);
+	sgl = kmalloc_array(sg_len, sizeof(*sgl), GFP_KERNEL);
 	if (!sgl)
 		return NULL;