diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index e3cd0b1..8653dac 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -836,7 +836,7 @@
 			static const int quantum_ms = 1000 / HZ;
 
 			ret = down_trylock(sem);
-			for (i = timeout; (i > 0 && ret < 0); i -= quantum_ms) {
+			for (i = timeout; (i > 0 && ret != 0); i -= quantum_ms) {
 				schedule_timeout_interruptible(1);
 				ret = down_trylock(sem);
 			}