On 12/20/2007 10:39 PM, Cory T. Tusar wrote:
> tty: Fix logic change introduced by wait_event_interruptible_timeout()
>
> Commit 5a52bd4a2dcb570333ce6fe2e16cd311650dbdc8 introduced a subtle logic
> change in tty_wait_until_sent(). The original version would only error
> out of the 'do { ... } while (timeout)' loop if signal_pending() evaluated
> to true; a timeout or break due to an empty buffer would fall out of the
> loop and into the tty->driver->wait_until_sent handling. The current
> implementation will error out on either a pending signal or an empty
> buffer, falling through to the tty->driver->wait_until_sent handling
> only on a timeout.
>
> This change reverts the logic flow in tty_wait_until_sent() to match that
> prior to the aforementioned commit.
>
> Signed-off-by: Cory T. Tusar <[email protected]>
Acked-by: Jiri Slaby <[email protected]>
>
> ---
> Please CC me on any replies; I'm not subscribed to lkml. Thanks.
>
> drivers/char/tty_ioctl.c | 2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c
> index 1bdd2bf..e02d592 100644
> --- a/drivers/char/tty_ioctl.c
> +++ b/drivers/char/tty_ioctl.c
> @@ -62,7 +62,7 @@ void tty_wait_until_sent(struct tty_struct * tty, long timeout)
> if (!timeout)
> timeout = MAX_SCHEDULE_TIMEOUT;
> if (wait_event_interruptible_timeout(tty->write_wait,
> - !tty->driver->chars_in_buffer(tty), timeout))
> + !tty->driver->chars_in_buffer(tty), timeout) < 0)
> return;
Thanks for tracking this down.
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