diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index b7d1514..507f051 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -746,6 +746,16 @@
 	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n",
 			  handle, units, timeout));
 
+	/*
+	 * This can be called during resume with interrupts off.
+	 * Like boot-time, we should be single threaded and will
+	 * always get the lock if we try -- timeout or not.
+	 * If this doesn't succeed, then we will oops courtesy of
+	 * might_sleep() in down().
+	 */
+	if (!down_trylock(sem))
+		return AE_OK;
+
 	switch (timeout) {
 		/*
 		 * No Wait: