[RESEND] staging: greybus: convert to DEFINE_SHOW_ATTRIBUTE

[RESEND] staging: greybus: convert to DEFINE_SHOW_ATTRIBUTE

[Yangtao Li]

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.

Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
---
 drivers/staging/greybus/loopback.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 7080294f705c..33cda7527714 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -973,19 +973,7 @@ static int gb_loopback_dbgfs_latency_show(struct seq_file *s, void *unused)
 	return gb_loopback_dbgfs_latency_show_common(s, &gb->kfifo_lat,
 						     &gb->mutex);
 }
-
-static int gb_loopback_latency_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, gb_loopback_dbgfs_latency_show,
-			   inode->i_private);
-}
-
-static const struct file_operations gb_loopback_debugfs_latency_ops = {
-	.open		= gb_loopback_latency_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(gb_loopback_dbgfs_latency);
 
 static int gb_loopback_bus_id_compare(void *priv, struct list_head *lha,
 				      struct list_head *lhb)
@@ -1076,7 +1064,7 @@ static int gb_loopback_probe(struct gb_bundle *bundle,
 	snprintf(name, sizeof(name), "raw_latency_%s",
 		 dev_name(&connection->bundle->dev));
 	gb->file = debugfs_create_file(name, S_IFREG | 0444, gb_dev.root, gb,
-				       &gb_loopback_debugfs_latency_ops);
+				       &gb_loopback_dbgfs_latency_fops);
 
 	gb->id = ida_simple_get(&loopback_ida, 0, 0, GFP_KERNEL);
 	if (gb->id < 0) {
-- 
2.17.0