diff --git a/sys/compat/linuxkpi/common/include/linux/spinlock.h b/sys/compat/linuxkpi/common/include/linux/spinlock.h
--- a/sys/compat/linuxkpi/common/include/linux/spinlock.h
+++ b/sys/compat/linuxkpi/common/include/linux/spinlock.h
@@ -163,15 +163,20 @@
 	mtx_assert(&(_l)->m, MA_OWNED);		\
 } while (0)
 
+#define	atomic_dec_and_lock_irqsave(cnt, lock, flags) \
+	_atomic_dec_and_lock_irqsave(cnt, lock, &(flags))
 static inline int
-atomic_dec_and_lock_irqsave(atomic_t *cnt, spinlock_t *lock,
-    unsigned long flags)
+_atomic_dec_and_lock_irqsave(atomic_t *cnt, spinlock_t *lock,
+    unsigned long *flags)
 {
-	spin_lock_irqsave(lock, flags);
+	if (atomic_add_unless(cnt, -1, 1))
+		return (0);
+
+	spin_lock_irqsave(lock, *flags);
 	if (atomic_dec_and_test(cnt))
-		return 1;
-	spin_unlock_irqrestore(lock, flags);
-	return 0;
+		return (1);
+	spin_unlock_irqrestore(lock, *flags);
+	return (0);
 }
 
 #endif					/* _LINUX_SPINLOCK_H_ */