virtio_blk: Use sysfs_match_string() helper

Use sysfs_match_string() helper instead of open coded variant.

Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 4e02aa5fdac053dfa254fb05aac1b2c252e4c1be..1498b899a593e31951c835f4f537d1bb03d0e596 100644 (file)
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -541,12 +541,9 @@ virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
        int i;
 
        BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
-       for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
-               if (sysfs_streq(buf, virtblk_cache_types[i]))
-                       break;
-
+       i = sysfs_match_string(virtblk_cache_types, buf);
        if (i < 0)
-               return -EINVAL;
+               return i;
 
        virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
        virtblk_update_cache_mode(vdev);