TTY: hvcs: fix missing unlock on error in hvcs_initialize()

Add the missing unlock on the error handling path in function
hvcs_initialize().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/tty/hvc/hvcs.c b/drivers/tty/hvc/hvcs.c
index cab5c7adf8e8..744c3b8eea49 100644
--- a/drivers/tty/hvc/hvcs.c
+++ b/drivers/tty/hvc/hvcs.c
@@ -1496,8 +1496,10 @@ static int __devinit hvcs_initialize(void)
                 num_ttys_to_alloc = hvcs_parm_num_devs;
 
         hvcs_tty_driver = alloc_tty_driver(num_ttys_to_alloc);
-        if (!hvcs_tty_driver)
+        if (!hvcs_tty_driver) {
+                mutex_unlock(&hvcs_init_mutex);
                 return -ENOMEM;
+        }
 
         if (hvcs_alloc_index_list(num_ttys_to_alloc)) {
                 rc = -ENOMEM;