diff options
| -rw-r--r-- | drivers/char/tty_ioctl.c | 11 |
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); |