linux-kernel - [PATCH 2/2] drivers/dma: drop unnecesary memset

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Date:	Sat, 19 Dec 2009 08:30:30 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Dan Williams <dan.j.williams@...el.com>,
	Maciej Sosnowski <maciej.sosnowski@...el.com>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 2/2] drivers/dma: drop unnecesary memset

From: Julia Lawall <julia@...u.dk>

memset of 0 is not needed after kzalloc

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

// <smpl>
@@
expression x;
statement S;
@@

x = kzalloc(...);
if (x == NULL) S
... when != x
-memset(x,0,...);// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/dma/dw_dmac.c |    2 --
 1 file changed, 2 deletions(-)

diff -u -p a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -1270,8 +1270,6 @@ static int __init dw_probe(struct platfo
 		goto err_kfree;
 	}
 
-	memset(dw, 0, sizeof *dw);
-
 	dw->regs = ioremap(io->start, DW_REGLEN);
 	if (!dw->regs) {
 		err = -ENOMEM;
--
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