linux-kernel - [PATCH 3/20] drivers/media: Use kzalloc

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Date:	Thu, 13 May 2010 21:59:15 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 3/20] drivers/media: Use kzalloc

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

Use kzalloc rather than the combination of kmalloc and memset.

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

// <smpl>
@@
expression x,size,flags;
statement S;
@@

-x = kmalloc(size,flags);
+x = kzalloc(size,flags);
 if (x == NULL) S
-memset(x, 0, size);
// </smpl>

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

---
 drivers/media/dvb/frontends/ds3000.c |    5 +----
 drivers/media/video/omap/omap_vout.c |    3 +--
 2 files changed, 2 insertions(+), 6 deletions(-)

diff -u -p a/drivers/media/dvb/frontends/ds3000.c b/drivers/media/dvb/frontends/ds3000.c
--- a/drivers/media/dvb/frontends/ds3000.c
+++ b/drivers/media/dvb/frontends/ds3000.c
@@ -969,15 +969,12 @@ struct dvb_frontend *ds3000_attach(const
 	dprintk("%s\n", __func__);
 
 	/* allocate memory for the internal state */
-	state = kmalloc(sizeof(struct ds3000_state), GFP_KERNEL);
+	state = kzalloc(sizeof(struct ds3000_state), GFP_KERNEL);
 	if (state == NULL) {
 		printk(KERN_ERR "Unable to kmalloc\n");
 		goto error2;
 	}
 
-	/* setup the state */
-	memset(state, 0, sizeof(struct ds3000_state));
-
 	state->config = config;
 	state->i2c = i2c;
 	state->prevUCBS2 = 0;
diff -u -p a/drivers/media/video/omap/omap_vout.c b/drivers/media/video/omap/omap_vout.c
--- a/drivers/media/video/omap/omap_vout.c
+++ b/drivers/media/video/omap/omap_vout.c
@@ -2371,12 +2371,11 @@ static int __init omap_vout_create_video
 
 	for (k = 0; k < pdev->num_resources; k++) {
 
-		vout = kmalloc(sizeof(struct omap_vout_device), GFP_KERNEL);
+		vout = kzalloc(sizeof(struct omap_vout_device), GFP_KERNEL);
 		if (!vout) {
 			dev_err(&pdev->dev, ": could not allocate memory\n");
 			return -ENOMEM;
 		}
-		memset(vout, 0, sizeof(struct omap_vout_device));
 
 		vout->vid = k;
 		vid_dev->vouts[k] = vout;
--
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