scsi: qla2xxx: Introduce DEFINE_SHOW_STORE_ATTRIBUTE for debugfs

Seq introduce a new helper macro DEFINE_SHOW_STORE_ATTRIBUTE for
Read-Write file, so we apply it at qla2xxx to reduce some duplicated code.

Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>

drivers/scsi/qla2xxx/qla_dfs.c

@@ -461,14 +461,6 @@ qla_dfs_naqp_show(struct seq_file *s, void *unused)
 	return 0;
 }
 
-static int
-qla_dfs_naqp_open(struct inode *inode, struct file *file)
-{
-	struct scsi_qla_host *vha = inode->i_private;
-
-	return single_open(file, qla_dfs_naqp_show, vha);
-}
-
 static ssize_t
 qla_dfs_naqp_write(struct file *file, const char __user *buffer,
     size_t count, loff_t *pos)
@@ -517,14 +509,7 @@ qla_dfs_naqp_write(struct file *file, const char __user *buffer,
 	return rc;
 }
 
-static const struct file_operations dfs_naqp_ops = {
-	.open		= qla_dfs_naqp_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-	.write		= qla_dfs_naqp_write,
-};
-
+DEFINE_SHOW_STORE_ATTRIBUTE(qla_dfs_naqp);
 
 int
 qla2x00_dfs_setup(scsi_qla_host_t *vha)
@@ -570,7 +555,7 @@ qla2x00_dfs_setup(scsi_qla_host_t *vha)
 
 	if (IS_QLA27XX(ha) || IS_QLA83XX(ha) || IS_QLA28XX(ha)) {
 		ha->tgt.dfs_naqp = debugfs_create_file("naqp",
-		    0400, ha->dfs_dir, vha, &dfs_naqp_ops);
+		    0400, ha->dfs_dir, vha, &qla_dfs_naqp_ops);
 		if (!ha->tgt.dfs_naqp) {
 			ql_log(ql_log_warn, vha, 0xd011,
 			       "Unable to create debugFS naqp node.\n");