rocket.c: fix unchecked mutex_lock_interruptible()

Check the return of mutex_lock_interruptible() in drivers/char/rocket.c and
return ERESTARTSYS if we were interrupted.

Signed-off-by: Satyam Sharma <satyam.sharma@gmail.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/char/rocket.c b/drivers/char/rocket.c
index a3fd7e7ba5a9..0270080ff0c0 100644
--- a/drivers/char/rocket.c
+++ b/drivers/char/rocket.c
@@ -1702,7 +1702,8 @@ static int rp_write(struct tty_struct *tty,
         if (count <= 0 || rocket_paranoia_check(info, "rp_write"))
                 return 0;
 
-        mutex_lock_interruptible(&info->write_mtx);
+        if (mutex_lock_interruptible(&info->write_mtx))
+                return -ERESTARTSYS;
 
 #ifdef ROCKET_DEBUG_WRITE
         printk(KERN_INFO "rp_write %d chars...", count);