linux-kernel - [patch] high-res timers: next

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Message-ID: <20061209113632.GA31648@elte.hu>
Date:	Sat, 9 Dec 2006 12:36:32 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...l.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Subject: [patch] high-res timers: next_event calculation fix

Subject: [patch] high-res timers: next_event calculation fix
From: Ingo Molnar <mingo@...e.hu>

do not set expires_next to KTIME_MAX if a too short timeout
is being set - this can result in the clock events device
being shut down completely.

found via a stresstest on a C3-lapic-plagued laptop that did
very short sleeps.

This bug could explain the 'Synaptics hang' that was reported.

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/time/clockevents.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Index: linux/kernel/time/clockevents.c
===================================================================
--- linux.orig/kernel/time/clockevents.c
+++ linux/kernel/time/clockevents.c
@@ -510,10 +510,8 @@ int clockevents_set_next_event(ktime_t e
 	struct clock_event_device *nextevt = devices->nextevt;
 	int64_t delta = ktime_to_ns(ktime_sub(expires, ktime_get()));
 
-	if (delta <= 0 && !force) {
-		devices->expires_next.tv64 = KTIME_MAX;
+	if (delta <= 0 && !force)
 		return -ETIME;
-	}
 
 	devices->expires_next = expires;
 
-
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