[PATCH net-next] net/9p: use DEVICE_ATTR_RO macro

[YueHaibing]

Use DEVICE_ATTR_RO helper instead of plain DEVICE_ATTR,
which makes the code a bit shorter and easier to read.

Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
 net/9p/trans_virtio.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 93f2f8654882..43339f314a86 100644
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -528,8 +528,8 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
 	return err;
 }
 
-static ssize_t p9_mount_tag_show(struct device *dev,
-				struct device_attribute *attr, char *buf)
+static ssize_t mount_tag_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
 {
 	struct virtio_chan *chan;
 	struct virtio_device *vdev;
@@ -544,7 +544,7 @@ static ssize_t p9_mount_tag_show(struct device *dev,
 	return tag_len + 1;
 }
 
-static DEVICE_ATTR(mount_tag, 0444, p9_mount_tag_show, NULL);
+static DEVICE_ATTR_RO(mount_tag);
 
 /**
  * p9_virtio_probe - probe for existence of 9P virtio channels
-- 
2.17.1