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authorMilton Miller <miltonm@bga.com>2005-07-07 17:56:18 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-07 18:23:38 -0700
commit8b67f8c177a642b35b7a05f530c12ef2834ef182 (patch)
treef1e0b3fc48737ccb8f88dd50f16721dec9ff97d8 /drivers
parent6f24808eeb54eed5994128a863cd25c40f36cfac (diff)
[PATCH] hvc_console: Dont always kick the poll thread in interrupt
Have the hvc console code try to pull characters immediately when receiving an interrupt, and kick the poll thread only if the immediate poll indicates it needed a call back to do more work. Signed-off-by: Milton Miller <miltonm@bga.com> Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/hvc_console.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
index 4b776f4eb46..46508a73706 100644
--- a/drivers/char/hvc_console.c
+++ b/drivers/char/hvc_console.c
@@ -254,13 +254,17 @@ static void hvc_kick(void)
wake_up_process(hvc_task);
}
+static int hvc_poll(struct hvc_struct *hp);
+
/*
* NOTE: This API isn't used if the console adapter doesn't support interrupts.
* In this case the console is poll driven.
*/
static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
{
- hvc_kick();
+ /* if hvc_poll request a repoll, then kick the hvcd thread */
+ if (hvc_poll(dev_instance))
+ hvc_kick();
return IRQ_HANDLED;
}
@@ -598,8 +602,8 @@ static int hvc_poll(struct hvc_struct *hp)
/*
* Account for the total amount read in one loop, and if above
- * 64 bytes, we do a quick schedule loop to let the tty grok the
- * data and eventually throttle us.
+ * 64 bytes, we do a quick schedule loop to let the tty grok
+ * the data and eventually throttle us.
*/
read_total += n;
if (read_total >= 64) {