diff options
| author | Ivo Sieben <meltedpianoman@gmail.com> | 2012-10-24 14:35:42 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-24 11:21:32 -0700 |
| commit | b8b345bae8cb6745f2afdd28bb2d93f9cf0d7f2c (patch) | |
| tree | b5d1e58545b23b90c70f4c1f9a35e00eb09b0816 /drivers/tty/tty_buffer.c | |
| parent | 6b898c07cb1d5bd8344a8044288bb4ae3873da74 (diff) | |
| download | linux-b8b345bae8cb6745f2afdd28bb2d93f9cf0d7f2c.tar.bz2 | |
TTY: Report warning when low_latency flag is wrongly used
When a driver has the low_latency flag set and uses the schedule_flip()
function to initiate copying data to the line discipline, a workqueue is
scheduled in but never actually flushed. This is incorrect use of the
low_latency flag (driver should not support the low_latency flag, or use
the tty_flip_buffer_push() function instead). Make sure a warning is
reported to catch incorrect use of the low_latency flag.
This patch goes with: cee4ad1ed90a0959fc29f9d30a2526e5e9522cfa
Signed-off-by: Ivo Sieben <meltedpianoman@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_buffer.c')
| -rw-r--r-- | drivers/tty/tty_buffer.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c index 06725f5cc819..6cf87d7afb7e 100644 --- a/drivers/tty/tty_buffer.c +++ b/drivers/tty/tty_buffer.c @@ -365,6 +365,7 @@ void tty_schedule_flip(struct tty_struct *tty) { struct tty_bufhead *buf = &tty->port->buf; unsigned long flags; + WARN_ON(tty->low_latency); spin_lock_irqsave(&buf->lock, flags); if (buf->tail != NULL) |