xen/blkback: use kmem_cache_zalloc instead of kmem_cache_alloc/memset

Using kmem_cache_zalloc() instead of kmem_cache_alloc() and memset().

spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index d0fed55..f58434c 100644 (file)
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -105,11 +105,10 @@ static struct xen_blkif *xen_blkif_alloc(domid_t domid)
 {
        struct xen_blkif *blkif;
 
-       blkif = kmem_cache_alloc(xen_blkif_cachep, GFP_KERNEL);
+       blkif = kmem_cache_zalloc(xen_blkif_cachep, GFP_KERNEL);
        if (!blkif)
                return ERR_PTR(-ENOMEM);
 
-       memset(blkif, 0, sizeof(*blkif));
        blkif->domid = domid;
        spin_lock_init(&blkif->blk_ring_lock);
        atomic_set(&blkif->refcnt, 1);