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authorJohan Hovold <johan@kernel.org>2015-03-04 10:39:07 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-07 03:44:15 +0100
commitc37bc682e30b8027054356214eb8a3aafbda8e37 (patch)
treed7dd1f756b4d9b27d9732a1d9ffc5325ffa80ab2
parent79fbf4a550ed6a22e1ae1516113e6c7fa5d56a53 (diff)
downloadkernel-c37bc682e30b8027054356214eb8a3aafbda8e37.tar.gz
TTY: fix tty_wait_until_sent maximum timeout
Currently tty_wait_until_sent may take up to twice as long as the requested timeout while waiting for driver and hardware buffers to drain. Fix this by taking the remaining number of jiffies after waiting for driver buffers to drain into account so that the timeout actually becomes a maximum timeout as it is documented to be. Note that this specifically implies tighter timings when closing a port as a consequence of actually honouring the port closing-wait setting for drivers relying on tty_wait_until_sent_from_close (e.g. via tty_port_close_start). Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/tty/tty_ioctl.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index 89ae23ac9ae6..632fc8152061 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -218,10 +218,10 @@ 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_chars_in_buffer(tty), timeout) < 0) {
+ timeout = wait_event_interruptible_timeout(tty->write_wait,
+ !tty_chars_in_buffer(tty), timeout);
+ if (timeout <= 0)
return;
- }
if (timeout == MAX_SCHEDULE_TIMEOUT)
timeout = 0;