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m68knommu: fix compare race in sched related code 

The interrupts must be disabled before considering the need resched
bit of the task struct and they have to be disabled before calling
schedule()

Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sebastian Siewior 2008-05-01 12:17:49 +10:00 committed by Linus Torvalds
parent 0042a1f7ec
commit 6c5a7d504f
1 changed files with 2 additions and 0 deletions
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2
arch/m68knommu/platform/coldfire/entry.S
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@ -103,6 +103,7 @@ ret_from_signal:
addql #4,%sp
ret_from_exception:
move #0x2700,%sr /* disable intrs */
btst #5,%sp@(PT_SR) /* check if returning to kernel */
jeq Luser_return /* if so, skip resched, signals */
@ -156,6 +157,7 @@ Lreturn:
Lwork_to_do:
movel %a0@(TI_FLAGS),%d1 /* get thread_info->flags */
move #0x2000,%sr /* enable intrs again */
btst #TIF_NEED_RESCHED,%d1
jne reschedule