[PATCH 4.14 03/11] r8152: Fix potential PM refcount imbalance

Greg Kroah-Hartman
2021-08-06T08:17:20Z

From: Takashi Iwai <tiwai@suse.de>

[ Upstream commit 9c23aa51477a37f8b56c3c40192248db0663c196 ]

rtl8152_close() takes the refcount via usb_autopm_get_interface() but
it doesn't release when RTL8152_UNPLUG test hits. This may lead to
the imbalance of PM refcount. This patch addresses it.

Link: https://bugzilla.suse.com/show_bug.cgi?id=1186194
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/usb/r8152.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index 8da3c891c9e8..a5a4fef09b93 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -3953,9 +3953,10 @@ static int rtl8152_close(struct net_device *netdev)
tp->rtl_ops.down(tp);

mutex_unlock(&tp->control);
+ }

+ if (!res)
usb_autopm_put_interface(tp->intf);
- }

free_all_mem(tp);

--
2.30.2