1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/char/synclink_gt.c b/drivers/char/synclink_gt.c
index 6473ae023466..1a11717b1adc 100644
--- a/drivers/char/synclink_gt.c
+++ b/drivers/char/synclink_gt.c
@@ -771,8 +771,7 @@ static void close(struct tty_struct *tty, struct file *filp)
 
         if (info->flags & ASYNC_INITIALIZED)
                 wait_until_sent(tty, info->timeout);
-        if (tty->driver->flush_buffer)
-                tty->driver->flush_buffer(tty);
+        flush_buffer(tty);
         tty_ldisc_flush(tty);
 
         shutdown(info);
@@ -967,6 +966,8 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
          * Note: use tight timings here to satisfy the NIST-PCTS.
          */
 
+        lock_kernel();
+
         if (info->params.data_rate) {
                 char_time = info->timeout/(32 * 5);
                 if (!char_time)
@@ -984,6 +985,7 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
                         break;
         }
+        unlock_kernel();
 
 exit:
         DBGINFO(("%s wait_until_sent exit\n", info->device_name));