linux-kernel - [GIT pull] hrtimer fixes

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Message-ID: <alpine.LFD.1.10.0804271947000.3261@apollo.tec.linutronix.de>
Date:	Sun, 27 Apr 2008 19:50:12 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [GIT pull] hrtimer fixes

Linus,

please pull hrtimer fixes from:

  ssh://master.kernel.org/pub/scm/linux/kernel/git/tglx/linux-2.6-hrt.git master

This fixes a long standing hrtimer reprogramming bug.

Thanks,
	tglx
---
Bodo Stroesser (1):
      hrtimer: timeout too long when using HRTIMER_CB_SOFTIRQ

 kernel/hrtimer.c |   15 +++++++++++++--
 1 files changed, 13 insertions(+), 2 deletions(-)
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index f78777a..e379ef0 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1080,8 +1080,19 @@ static void run_hrtimer_pending(struct hrtimer_cpu_base *cpu_base)
 			 * If the timer was rearmed on another CPU, reprogram
 			 * the event device.
 			 */
-			if (timer->base->first == &timer->node)
-				hrtimer_reprogram(timer, timer->base);
+			struct hrtimer_clock_base *base = timer->base;
+
+			if (base->first == &timer->node &&
+			    hrtimer_reprogram(timer, base)) {
+				/*
+				 * Timer is expired. Thus move it from tree to
+				 * pending list again.
+				 */
+				__remove_hrtimer(timer, base,
+						 HRTIMER_STATE_PENDING, 0);
+				list_add_tail(&timer->cb_entry,
+					      &base->cpu_base->cb_pending);
+			}
 		}
 	}
 	spin_unlock_irq(&cpu_base->lock);
--
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