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author | Amerigo Wang <amwang@redhat.com> | 2009-12-14 18:00:21 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 08:53:26 -0800 |
commit | 29671f22a8b6522db3b126a3fdfb208759ce46e3 (patch) | |
tree | c3c434fc07aae30c401fe7662b8e1399b98ffdc2 /include/linux/rwsem-spinlock.h | |
parent | 118d52da1816471ac875bb9f1ee51737e82b1d71 (diff) | |
download | linux-stable-29671f22a8b6522db3b126a3fdfb208759ce46e3.tar.gz linux-stable-29671f22a8b6522db3b126a3fdfb208759ce46e3.tar.bz2 linux-stable-29671f22a8b6522db3b126a3fdfb208759ce46e3.zip |
rwsem: fix rwsem_is_locked() bugs
rwsem_is_locked() tests ->activity without locks, so we should always keep
->activity consistent. However, the code in __rwsem_do_wake() breaks this
rule, it updates ->activity after _all_ readers waken up, this may give
some reader a wrong ->activity value, thus cause rwsem_is_locked() behaves
wrong.
Quote from Andrew:
"
- we have one or more processes sleeping in down_read(), waiting for access.
- we wake one or more processes up without altering ->activity
- they start to run and they do rwsem_is_locked(). This incorrectly
returns "false", because the waker process is still crunching away in
__rwsem_do_wake().
- the waker now alters ->activity, but it was too late.
"
So we need get a spinlock to protect this. And rwsem_is_locked() should
not block, thus we use spin_trylock_irqsave().
[akpm@linux-foundation.org: simplify code]
Reported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Cc: Ben Woodard <bwoodard@llnl.gov>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: WANG Cong <amwang@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/rwsem-spinlock.h')
-rw-r--r-- | include/linux/rwsem-spinlock.h | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/include/linux/rwsem-spinlock.h b/include/linux/rwsem-spinlock.h index 6c3c0f6c261f..bdfcc2527970 100644 --- a/include/linux/rwsem-spinlock.h +++ b/include/linux/rwsem-spinlock.h @@ -68,11 +68,7 @@ extern int __down_write_trylock(struct rw_semaphore *sem); extern void __up_read(struct rw_semaphore *sem); extern void __up_write(struct rw_semaphore *sem); extern void __downgrade_write(struct rw_semaphore *sem); - -static inline int rwsem_is_locked(struct rw_semaphore *sem) -{ - return (sem->activity != 0); -} +extern int rwsem_is_locked(struct rw_semaphore *sem); #endif /* __KERNEL__ */ #endif /* _LINUX_RWSEM_SPINLOCK_H */ |