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Diffstat (limited to 'arch/sh/include/asm/rwsem.h')
-rw-r--r--arch/sh/include/asm/rwsem.h14
1 files changed, 2 insertions, 12 deletions
diff --git a/arch/sh/include/asm/rwsem.h b/arch/sh/include/asm/rwsem.h
index a5104be..f6c951c 100644
--- a/arch/sh/include/asm/rwsem.h
+++ b/arch/sh/include/asm/rwsem.h
@@ -24,9 +24,7 @@
*/
static inline void __down_read(struct rw_semaphore *sem)
{
- if (atomic_inc_return((atomic_t *)(&sem->count)) > 0)
- smp_wmb();
- else
+ if (atomic_inc_return((atomic_t *)(&sem->count)) <= 0)
rwsem_down_read_failed(sem);
}
@@ -37,7 +35,6 @@ static inline int __down_read_trylock(struct rw_semaphore *sem)
while ((tmp = sem->count) >= 0) {
if (tmp == cmpxchg(&sem->count, tmp,
tmp + RWSEM_ACTIVE_READ_BIAS)) {
- smp_wmb();
return 1;
}
}
@@ -53,9 +50,7 @@ static inline void __down_write(struct rw_semaphore *sem)
tmp = atomic_add_return(RWSEM_ACTIVE_WRITE_BIAS,
(atomic_t *)(&sem->count));
- if (tmp == RWSEM_ACTIVE_WRITE_BIAS)
- smp_wmb();
- else
+ if (tmp != RWSEM_ACTIVE_WRITE_BIAS)
rwsem_down_write_failed(sem);
}
@@ -65,7 +60,6 @@ static inline int __down_write_trylock(struct rw_semaphore *sem)
tmp = cmpxchg(&sem->count, RWSEM_UNLOCKED_VALUE,
RWSEM_ACTIVE_WRITE_BIAS);
- smp_wmb();
return tmp == RWSEM_UNLOCKED_VALUE;
}
@@ -76,7 +70,6 @@ static inline void __up_read(struct rw_semaphore *sem)
{
int tmp;
- smp_wmb();
tmp = atomic_dec_return((atomic_t *)(&sem->count));
if (tmp < -1 && (tmp & RWSEM_ACTIVE_MASK) == 0)
rwsem_wake(sem);
@@ -87,7 +80,6 @@ static inline void __up_read(struct rw_semaphore *sem)
*/
static inline void __up_write(struct rw_semaphore *sem)
{
- smp_wmb();
if (atomic_sub_return(RWSEM_ACTIVE_WRITE_BIAS,
(atomic_t *)(&sem->count)) < 0)
rwsem_wake(sem);
@@ -108,7 +100,6 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
{
int tmp;
- smp_wmb();
tmp = atomic_add_return(-RWSEM_WAITING_BIAS, (atomic_t *)(&sem->count));
if (tmp < 0)
rwsem_downgrade_wake(sem);
@@ -119,7 +110,6 @@ static inline void __downgrade_write(struct rw_semaphore *sem)
*/
static inline int rwsem_atomic_update(int delta, struct rw_semaphore *sem)
{
- smp_mb();
return atomic_add_return(delta, (atomic_t *)(&sem->count));
}
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