diff options
Diffstat (limited to 'arch/tile/lib/spinlock_64.c')
| -rw-r--r-- | arch/tile/lib/spinlock_64.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/tile/lib/spinlock_64.c b/arch/tile/lib/spinlock_64.c index d6fb9581e..c8d1f94ff 100644 --- a/arch/tile/lib/spinlock_64.c +++ b/arch/tile/lib/spinlock_64.c @@ -65,8 +65,17 @@ EXPORT_SYMBOL(arch_spin_trylock); void arch_spin_unlock_wait(arch_spinlock_t *lock) { u32 iterations = 0; - while (arch_spin_is_locked(lock)) + u32 val = READ_ONCE(lock->lock); + u32 curr = arch_spin_current(val); + + /* Return immediately if unlocked. */ + if (arch_spin_next(val) == curr) + return; + + /* Wait until the current locker has released the lock. */ + do { delay_backoff(iterations++); + } while (arch_spin_current(READ_ONCE(lock->lock)) == curr); } EXPORT_SYMBOL(arch_spin_unlock_wait); |