mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
powerpc: Fix spin_event_timeout() to be robust over context switches
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:
parent
30c5af435b
commit
ad9064d5e2
1 changed files with 2 additions and 0 deletions
|
@ -63,6 +63,8 @@ extern void udelay(unsigned long usecs);
|
|||
udelay(delay); \
|
||||
else \
|
||||
cpu_relax(); \
|
||||
if (!__ret) \
|
||||
__ret = (condition); \
|
||||
__ret; \
|
||||
})
|
||||
|
||||
|
|
Loading…
Reference in a new issue