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Diffstat (limited to 'arch/tile/lib/spinlock_32.c')
-rw-r--r--arch/tile/lib/spinlock_32.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/tile/lib/spinlock_32.c b/arch/tile/lib/spinlock_32.c
index b34f79aad..88c2a5336 100644
--- a/arch/tile/lib/spinlock_32.c
+++ b/arch/tile/lib/spinlock_32.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))
+ int curr = READ_ONCE(lock->current_ticket);
+ int next = READ_ONCE(lock->next_ticket);
+
+ /* Return immediately if unlocked. */
+ if (next == curr)
+ return;
+
+ /* Wait until the current locker has released the lock. */
+ do {
delay_backoff(iterations++);
+ } while (READ_ONCE(lock->current_ticket) == curr);
}
EXPORT_SYMBOL(arch_spin_unlock_wait);