1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/char/stallion.c b/drivers/char/stallion.c
index 983244ab1362..d17be10c5d21 100644
--- a/drivers/char/stallion.c
+++ b/drivers/char/stallion.c
@@ -875,6 +875,7 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
                 timeout = HZ;
         tend = jiffies + timeout;
 
+        lock_kernel();
         while (stl_datastate(portp)) {
                 if (signal_pending(current))
                         break;
@@ -882,6 +883,7 @@ static void stl_waituntilsent(struct tty_struct *tty, int timeout)
                 if (time_after_eq(jiffies, tend))
                         break;
         }
+        unlock_kernel();
 }
 
 /*****************************************************************************/