voron

commit 7376a2f9beca5c6c6b5c912ae19d448d100b6ab3
parent 52248cc8fdfde5ed24e095b9a977e48df943972c
Author: oblique <psyberbits@gmail.com>
Date:   Mon,  1 Apr 2013 20:45:23 +0300

semaphore.h: fix mutex_unlock

Diffstat:
M
include/semaphore.h
 | 
7
+++++++

1 file changed, 7 insertions(+), 0 deletions(-)
diff --git a/include/semaphore.h b/include/semaphore.h
@@ -98,6 +98,13 @@ mutex_lock(mutex_t *mut)
 static inline void
 mutex_unlock(mutex_t *mut)
 {
+	spinlock_lock(&mut->sem.lock);
+	/* if it's already unlocked, do nothing */
+	if (mut->sem.counter == 1) {
+		spinlock_unlock(&mut->sem.lock);
+		return;
+	}
+	spinlock_unlock(&mut->sem.lock);
 	semaphore_done(&mut->sem);
 }