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);