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sh: Fixup __raw_read_trylock().

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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>
This commit is contained in:
Paul Mundt 2006-10-03 14:13:09 +09:00
parent 2914d4da17
commit fac99d9746
1 changed files with 8 additions and 1 deletions
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9
include/asm-sh/spinlock.h
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@ -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)
{