scsi: qedf: Use DEVICE_ATTR_RO() macro

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

Link: https://lore.kernel.org/r/20210616034419.725-3-thunder.leizhen@huawei.com
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: Zhen Lei

drivers/scsi/qedf/qedf_attr.c

@@ -24,9 +24,8 @@ static struct qedf_ctx *qedf_get_base_qedf(struct qedf_ctx *qedf)
 	return lport_priv(base_lport);
 }
 
-static ssize_t
-qedf_fcoe_mac_show(struct device *dev,
-	struct device_attribute *attr, char *buf)
+static ssize_t fcoe_mac_show(struct device *dev,
+			     struct device_attribute *attr, char *buf)
 {
 	struct fc_lport *lport = shost_priv(class_to_shost(dev));
 	u32 port_id;
@@ -42,9 +41,8 @@ qedf_fcoe_mac_show(struct device *dev,
 	return scnprintf(buf, PAGE_SIZE, "%pM\n", fcoe_mac);
 }
 
-static ssize_t
-qedf_fka_period_show(struct device *dev,
-	struct device_attribute *attr, char *buf)
+static ssize_t fka_period_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
 {
 	struct fc_lport *lport = shost_priv(class_to_shost(dev));
 	struct qedf_ctx *qedf = lport_priv(lport);
@@ -59,8 +57,8 @@ qedf_fka_period_show(struct device *dev,
 	return scnprintf(buf, PAGE_SIZE, "%d\n", fka_period);
 }
 
-static DEVICE_ATTR(fcoe_mac, S_IRUGO, qedf_fcoe_mac_show, NULL);
-static DEVICE_ATTR(fka_period, S_IRUGO, qedf_fka_period_show, NULL);
+static DEVICE_ATTR_RO(fcoe_mac);
+static DEVICE_ATTR_RO(fka_period);
 
 struct device_attribute *qedf_host_attrs[] = {
 	&dev_attr_fcoe_mac,