virtio_blk: Use sysfs_match_string() helper

andy-shev · mstsirkin · commit f53d5aa050da · 2017-07-25T16:37:34.000+03:00
Use sysfs_match_string() helper instead of open coded variant.

Cc: "Michael S. Tsirkin" &lt;mst@redhat.com&gt;
Cc: Jason Wang &lt;jasowang@redhat.com&gt;
Signed-off-by: Andy Shevchenko &lt;andriy.shevchenko@linux.intel.com&gt;
Signed-off-by: Michael S. Tsirkin &lt;mst@redhat.com&gt;
Reviewed-by: Jason Wang &lt;jasowang@redhat.com&gt;
diff --git 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);
