cdc-acm.c: fix stable merge

Signed-off-by: Maxim Uvarov <maxim.uvarov@oracle.com>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index a76e715d90204fcab9ddaa721d994e77b4dc0fe9..158f63121434cdc4119f7e01bb8e82cacf2013ea 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -563,7 +563,6 @@ static void acm_tty_hangup(struct tty_struct *tty)
                goto out;
 
        tty_port_hangup(&acm->port);
-       mutex_lock(&open_mutex);
        acm_port_down(acm);
 
 out: