net: ethernet: mtk_eth_soc: use DEFINE_SHOW_ATTRIBUTE to simplify code

Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code.
No functional change.
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Link: https://lore.kernel.org/r/20220927111925.2424100-1-liushixin2@huawei.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/mediatek/mtk_ppe_debugfs.c

@@ -162,52 +162,28 @@ mtk_ppe_debugfs_foe_show(struct seq_file *m, void *private, bool bind)
 }
 
 static int
-mtk_ppe_debugfs_foe_show_all(struct seq_file *m, void *private)
+mtk_ppe_debugfs_foe_all_show(struct seq_file *m, void *private)
 {
 	return mtk_ppe_debugfs_foe_show(m, private, false);
 }
+DEFINE_SHOW_ATTRIBUTE(mtk_ppe_debugfs_foe_all);
 
 static int
-mtk_ppe_debugfs_foe_show_bind(struct seq_file *m, void *private)
+mtk_ppe_debugfs_foe_bind_show(struct seq_file *m, void *private)
 {
 	return mtk_ppe_debugfs_foe_show(m, private, true);
 }
-
-static int
-mtk_ppe_debugfs_foe_open_all(struct inode *inode, struct file *file)
-{
-	return single_open(file, mtk_ppe_debugfs_foe_show_all,
-			   inode->i_private);
-}
-
-static int
-mtk_ppe_debugfs_foe_open_bind(struct inode *inode, struct file *file)
-{
-	return single_open(file, mtk_ppe_debugfs_foe_show_bind,
-			   inode->i_private);
-}
+DEFINE_SHOW_ATTRIBUTE(mtk_ppe_debugfs_foe_bind);
 
 int mtk_ppe_debugfs_init(struct mtk_ppe *ppe, int index)
 {
-	static const struct file_operations fops_all = {
-		.open = mtk_ppe_debugfs_foe_open_all,
-		.read = seq_read,
-		.llseek = seq_lseek,
-		.release = single_release,
-	};
-	static const struct file_operations fops_bind = {
-		.open = mtk_ppe_debugfs_foe_open_bind,
-		.read = seq_read,
-		.llseek = seq_lseek,
-		.release = single_release,
-	};
 	struct dentry *root;
 
 	snprintf(ppe->dirname, sizeof(ppe->dirname), "ppe%d", index);
 
 	root = debugfs_create_dir(ppe->dirname, NULL);
-	debugfs_create_file("entries", S_IRUGO, root, ppe, &fops_all);
-	debugfs_create_file("bind", S_IRUGO, root, ppe, &fops_bind);
+	debugfs_create_file("entries", S_IRUGO, root, ppe, &mtk_ppe_debugfs_foe_all_fops);
+	debugfs_create_file("bind", S_IRUGO, root, ppe, &mtk_ppe_debugfs_foe_bind_fops);
 
 	return 0;
 }