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powerpc: Fix spin_event_timeout() to be robust over context switches

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Current implementation of spin_event_timeout can be interrupted by an
IRQ or context switch after testing the condition, but before checking
the timeout.  This can cause the loop to report a timeout when the
condition actually became true in the middle.

This patch adds one final check of the condition upon exit of the loop
if the last test of the condition was still false.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Grant Likely 2009-06-29 13:40:51 +00:00 committed by Benjamin Herrenschmidt
parent 30c5af435b
commit ad9064d5e2
1 changed files with 2 additions and 0 deletions
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2
arch/powerpc/include/asm/delay.h
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@ -63,6 +63,8 @@ extern void udelay(unsigned long usecs);
udelay(delay); \
else \
cpu_relax(); \
if (!__ret) \
__ret = (condition); \
__ret; \
})