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| author | Paul Mundt <lethal@linux-sh.org> | 2006-10-03 14:13:09 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2006-10-03 14:13:09 +0900 |
| commit | fac99d97469e7f91102f97101bea620e5f073196 (patch) | |
| tree | dc1c9dfc3bebfb6fc0a2fd48b8f5c8b7a90c017a | |
| parent | 2914d4da172f53f71d0563d3c3bae14e496cbc86 (diff) | |
| download | linux-fac99d97469e7f91102f97101bea620e5f073196.tar.gz linux-fac99d97469e7f91102f97101bea620e5f073196.tar.bz2 linux-fac99d97469e7f91102f97101bea620e5f073196.zip | |
sh: Fixup __raw_read_trylock().
generic__raw_read_trylock() was broken, fix up the __raw_read_trylock()
implementation for something sensible. Taken from m32r, which has the
same use cases.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
| -rw-r--r-- | include/asm-sh/spinlock.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/asm-sh/spinlock.h b/include/asm-sh/spinlock.h index 54458fd24981..2586eef07d57 100644 --- a/include/asm-sh/spinlock.h +++ b/include/asm-sh/spinlock.h @@ -88,7 +88,14 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw) __raw_spin_unlock(&rw->lock); } -#define __raw_read_trylock(lock) generic__raw_read_trylock(lock) +static inline int __raw_read_trylock(raw_rwlock_t *lock) +{ + atomic_t *count = (atomic_t*)lock; + if (atomic_dec_return(count) >= 0) + return 1; + atomic_inc(count); + return 0; +} static inline int __raw_write_trylock(raw_rwlock_t *rw) { |