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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-27 14:13:33 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-27 14:13:33 (GMT) |
| commit | e372dc6c62bf0246a07f3291a26c562cc8659fbd (patch) | |
| tree | c7039c1d1005b80e427761ba768d7697ae4a0b72 /include/asm-generic/mutex-xchg.h | |
| parent | 5d4121c04b3577e37e389b3553d442f44bb346d7 (diff) | |
| parent | fea7a08acb13524b47711625eebea40a0ede69a0 (diff) | |
| download | linux-fsl-qoriq-e372dc6c62bf0246a07f3291a26c562cc8659fbd.tar.xz | |
Merge 3.6-rc3 into tty-next
This picks up all of the different fixes in Linus's tree that we also need here.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/asm-generic/mutex-xchg.h')
| -rw-r--r-- | include/asm-generic/mutex-xchg.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/include/asm-generic/mutex-xchg.h b/include/asm-generic/mutex-xchg.h index 580a6d3..c04e0db 100644 --- a/include/asm-generic/mutex-xchg.h +++ b/include/asm-generic/mutex-xchg.h @@ -26,7 +26,13 @@ static inline void __mutex_fastpath_lock(atomic_t *count, void (*fail_fn)(atomic_t *)) { if (unlikely(atomic_xchg(count, 0) != 1)) - fail_fn(count); + /* + * We failed to acquire the lock, so mark it contended + * to ensure that any waiting tasks are woken up by the + * unlock slow path. + */ + if (likely(atomic_xchg(count, -1) != 1)) + fail_fn(count); } /** @@ -43,7 +49,8 @@ static inline int __mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *)) { if (unlikely(atomic_xchg(count, 0) != 1)) - return fail_fn(count); + if (likely(atomic_xchg(count, -1) != 1)) + return fail_fn(count); return 0; } |