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| author | Jeff Dike <jdike@addtoit.com> | 2006-01-06 00:18:58 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:33:46 -0800 |
| commit | e4dcee8099802c71437a15b940f66106d9f88b2f (patch) | |
| tree | b4831639d38369fce2e20fd40730425ca702102c /arch/um/drivers/line.c | |
| parent | 9159c9dfffe1746d58b015ceaa3b7b8e99ee9d5c (diff) | |
| download | linux-e4dcee8099802c71437a15b940f66106d9f88b2f.tar.gz linux-e4dcee8099802c71437a15b940f66106d9f88b2f.tar.bz2 linux-e4dcee8099802c71437a15b940f66106d9f88b2f.zip | |
[PATCH] uml: Add throttling to console driver
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>
Diffstat (limited to 'arch/um/drivers/line.c')
| -rw-r--r-- | arch/um/drivers/line.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c index 851a7c8caae5..b8e3e800ee41 100644 --- a/arch/um/drivers/line.c +++ b/arch/um/drivers/line.c @@ -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) { |