linux-kernel - [PATCH -v2] hrtimer: fix hrtimer_init

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Date:	Thu, 31 Jan 2008 16:42:50 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Guillaume Chazarain <guichaz@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH -v2] hrtimer: fix hrtimer_init_sleeper() users

this time build tested

---
Subject: hrtimer: fix hrtimer_init_sleeper() users

commit 37bb6cb4097e29ffee970065b74499cbf10603a3
Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date:   Fri Jan 25 21:08:32 2008 +0100

    hrtimer: unlock hrtimer_wakeup

Broke hrtimer_init_sleeper() users. It forgot to fix up the futex
caller of this function to detect the failed queueing and messed up
the do_nanosleep() caller in that it could leak a TASK_INTERRUPTIBLE
state.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 kernel/futex.c   |    2 ++
 kernel/hrtimer.c |    2 ++
 2 files changed, 4 insertions(+)

Index: linux-2.6/kernel/hrtimer.c
===================================================================
--- linux-2.6.orig/kernel/hrtimer.c
+++ linux-2.6/kernel/hrtimer.c
@@ -1312,6 +1312,8 @@ static int __sched do_nanosleep(struct h
 
 	} while (t->task && !signal_pending(current));
 
+	__set_current_state(TASK_RUNNING);
+
 	return t->task == NULL;
 }
 
Index: linux-2.6/kernel/futex.c
===================================================================
--- linux-2.6.orig/kernel/futex.c
+++ linux-2.6/kernel/futex.c
@@ -1252,6 +1252,8 @@ static int futex_wait(u32 __user *uaddr,
 			t.timer.expires = *abs_time;
 
 			hrtimer_start(&t.timer, t.timer.expires, HRTIMER_MODE_ABS);
+			if (!hrtimer_active(&t.timer))
+				t.task = NULL;
 
 			/*
 			 * the timer could have already expired, in which


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