char: virtio: Change to use DEFINE_SHOW_ATTRIBUTE macro

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.

Signed-off-by: Yangtao Li <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/char/virtio_console.c

···
 	.attrs = port_sysfs_entries,
 };
 
-static int debugfs_show(struct seq_file *s, void *data)
+static int port_debugfs_show(struct seq_file *s, void *data)
 {
 	struct port *port = s->private;
 
···
 	return 0;
 }
 
-static int debugfs_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, debugfs_show, inode->i_private);
-}
-
-static const struct file_operations port_debugfs_ops = {
-	.owner = THIS_MODULE,
-	.open = debugfs_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(port_debugfs);
 
 static void set_console_size(struct port *port, u16 rows, u16 cols)
 {
···
 		port->debugfs_file = debugfs_create_file(debugfs_name, 0444,
 							 pdrvdata.debugfs_dir,
 							 port,
-							 &port_debugfs_ops);
+							 &port_debugfs_fops);
 	}
 	return 0;