From dad459e052dc73493a4058b0f05f7e210691a0ba Mon Sep 17 00:00:00 2001
From: Tiezhu Yang <kernelpatch@126.com>
Date: Sat, 26 May 2018 22:46:22 +0800
Subject: [PATCH] staging: rtlwifi: use single_open and single_release properly
Git-commit: dad459e052dc73493a4058b0f05f7e210691a0ba
Patch-mainline: v4.18-rc1
References: FATE#326887

single_open() returns -ENOMEM when malloc failed, so the caller function
rtl_debugfs_open_rw() should not always return 0. In addition, when using
single_open(), we should use single_release() instead of seq_release() in
the file_operations structure to avoid a memory leak.

Signed-off-by: Tiezhu Yang <kernelpatch@126.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/staging/rtlwifi/debug.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/rtlwifi/debug.c b/drivers/staging/rtlwifi/debug.c
index c041bc315616..bf360f855c12 100644
--- a/drivers/staging/rtlwifi/debug.c
+++ b/drivers/staging/rtlwifi/debug.c
@@ -95,7 +95,7 @@ static const struct file_operations file_ops_common = {
 	.open = dl_debug_open_common,
 	.read = seq_read,
 	.llseek = seq_lseek,
-	.release = seq_release,
+	.release = single_release,
 };
 
 static int rtl_debug_get_mac_page(struct seq_file *m, void *v)
@@ -485,18 +485,20 @@ static int rtl_debug_get_phydm_cmd(struct seq_file *m, void *v)
 
 static int rtl_debugfs_open_rw(struct inode *inode, struct file *filp)
 {
+	int ret = 0;
+
 	if (filp->f_mode & FMODE_READ)
-		single_open(filp, rtl_debug_get_common, inode->i_private);
+		ret = single_open(filp, rtl_debug_get_common, inode->i_private);
 	else
 		filp->private_data = inode->i_private;
 
-	return 0;
+	return ret;
 }
 
 static int rtl_debugfs_close_rw(struct inode *inode, struct file *filp)
 {
 	if (filp->f_mode == FMODE_READ)
-		seq_release(inode, filp);
+		single_release(inode, filp);
 
 	return 0;
 }
-- 
2.19.1