[PATCH 4/4] use device_attr macros for sysfs attribute

["Pranay Kr. Srivastava" <pranjas@gmail.com>]

This patch changes the pid sysfs device attribute to use
DEVICE_ATTR_* macro.

Signed-off-by: Pranay Kr. Srivastava <pranjas@gmail.com>
---
 drivers/block/nbd.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 59db890..d6ab9c9 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -436,10 +436,8 @@ static ssize_t pid_show(struct device *dev,
 	return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv));
 }
 
-static struct device_attribute pid_attr = {
-	.attr = { .name = "pid", .mode = S_IRUGO},
-	.show = pid_show,
-};
+
+static DEVICE_ATTR_RO(pid);
 
 static int nbd_thread_recv(struct nbd_device *nbd, struct block_device *bdev)
 {
@@ -452,7 +450,7 @@ static int nbd_thread_recv(struct nbd_device *nbd, struct block_device *bdev)
 
 	nbd->task_recv = current;
 
-	ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr);
+	ret = device_create_file(disk_to_dev(nbd->disk), &dev_attr_pid);
 	if (ret) {
 		dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n");
 
@@ -475,7 +473,7 @@ static int nbd_thread_recv(struct nbd_device *nbd, struct block_device *bdev)
 
 	nbd_size_clear(nbd, bdev);
 
-	device_remove_file(disk_to_dev(nbd->disk), &pid_attr);
+	device_remove_file(disk_to_dev(nbd->disk), &dev_attr_pid);
 
 	nbd->task_recv = NULL;
 
-- 
1.7.9.5