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[PATCH] uml: Add throttling to console driver

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This patch adds support for throttling and unthrottling input when the tty
driver can't handle it.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jeff Dike
2006-01-06 00:18:58 -08:00
committed by Linus Torvalds
parent 9159c9dfff
commit e4dcee8099
6 changed files with 63 additions and 14 deletions
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29
arch/um/drivers/line.c
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@@ -36,8 +36,9 @@ static void line_timer_cb(void *arg)
{
struct line *line = arg;
chan_interrupt(&line->chan_list, &line->task, line->tty,
line->driver->read_irq);
if(!line->throttled)
chan_interrupt(&line->chan_list, &line->task, line->tty,
line->driver->read_irq);
}
/* Returns the free space inside the ring buffer of this line.
@@ -340,6 +341,30 @@ int line_ioctl(struct tty_struct *tty, struct file * file,
return ret;
}
void line_throttle(struct tty_struct *tty)
{
struct line *line = tty->driver_data;
deactivate_chan(&line->chan_list, line->driver->read_irq);
line->throttled = 1;
}
void line_unthrottle(struct tty_struct *tty)
{
struct line *line = tty->driver_data;
line->throttled = 0;
chan_interrupt(&line->chan_list, &line->task, tty,
line->driver->read_irq);
/* Maybe there is enough stuff pending that calling the interrupt
* throttles us again. In this case, line->throttled will be 1
* again and we shouldn't turn the interrupt back on.
*/
if(!line->throttled)
reactivate_chan(&line->chan_list, line->driver->read_irq);
}
static irqreturn_t line_write_interrupt(int irq, void *data,
struct pt_regs *unused)
{