drivers/gpu/drm: Use kzalloc

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@diku.dk>
Reviewed-by: Corbin Simpson <MostAwesomeDude@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/drm_auth.c

@@ -79,10 +79,9 @@ static int drm_add_magic(struct drm_master *master, struct drm_file *priv,
 	struct drm_device *dev = master->minor->dev;
 	DRM_DEBUG("%d\n", magic);
 
-	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
+	entry = kzalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry)
 		return -ENOMEM;
-	memset(entry, 0, sizeof(*entry));
 	entry->priv = priv;
 	entry->hash_item.key = (unsigned long)magic;
 	mutex_lock(&dev->struct_mutex);

drivers/gpu/drm/drm_dma.c

@@ -47,12 +47,10 @@ int drm_dma_setup(struct drm_device *dev)
 {
 	int i;
 
-	dev->dma = kmalloc(sizeof(*dev->dma), GFP_KERNEL);
+	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
 	if (!dev->dma)
 		return -ENOMEM;
 
-	memset(dev->dma, 0, sizeof(*dev->dma));
-
 	for (i = 0; i <= DRM_MAX_ORDER; i++)
 		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
 

drivers/gpu/drm/drm_fops.c

@@ -243,11 +243,10 @@ static int drm_open_helper(struct inode *inode, struct file *filp,
 
 	DRM_DEBUG("pid = %d, minor = %d\n", task_pid_nr(current), minor_id);
 
-	priv = kmalloc(sizeof(*priv), GFP_KERNEL);
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
-	memset(priv, 0, sizeof(*priv));
 	filp->private_data = priv;
 	priv->filp = filp;
 	priv->uid = current_euid();

drivers/gpu/drm/savage/savage_bci.c

@@ -539,11 +539,10 @@ int savage_driver_load(struct drm_device *dev, unsigned long chipset)
 {
 	drm_savage_private_t *dev_priv;
 
-	dev_priv = kmalloc(sizeof(drm_savage_private_t), GFP_KERNEL);
+	dev_priv = kzalloc(sizeof(drm_savage_private_t), GFP_KERNEL);
 	if (dev_priv == NULL)
 		return -ENOMEM;
 
-	memset(dev_priv, 0, sizeof(drm_savage_private_t));
 	dev->dev_private = (void *)dev_priv;
 
 	dev_priv->chipset = (enum savage_family)chipset;