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>
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@ -88,7 +88,14 @@ static inline void __raw_write_unlock(raw_rwlock_t *rw)
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__raw_spin_unlock(&rw->lock);
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}
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#define __raw_read_trylock(lock) generic__raw_read_trylock(lock)
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static inline int __raw_read_trylock(raw_rwlock_t *lock)
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{
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atomic_t *count = (atomic_t*)lock;
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if (atomic_dec_return(count) >= 0)
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return 1;
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atomic_inc(count);
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return 0;
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}
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static inline int __raw_write_trylock(raw_rwlock_t *rw)
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{
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