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-rw-r--r--drivers/char/tty_ioctl.c11
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
index d6353d89b45..851cfcd2702 100644
--- a/drivers/char/tty_ioctl.c
+++ b/drivers/char/tty_ioctl.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/mutex.h>
+#include <linux/smp_lock.h>
#include <asm/io.h>
#include <asm/uaccess.h>
@@ -61,11 +62,13 @@ void tty_wait_until_sent(struct tty_struct *tty, long timeout)
return;
if (!timeout)
timeout = MAX_SCHEDULE_TIMEOUT;
+ lock_kernel();
if (wait_event_interruptible_timeout(tty->write_wait,
- !tty->driver->chars_in_buffer(tty), timeout) < 0)
- return;
- if (tty->driver->wait_until_sent)
- tty->driver->wait_until_sent(tty, timeout);
+ !tty->driver->chars_in_buffer(tty), timeout) >= 0) {
+ if (tty->driver->wait_until_sent)
+ tty->driver->wait_until_sent(tty, timeout);
+ }
+ unlock_kernel();
}
EXPORT_SYMBOL(tty_wait_until_sent);