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-rw-r--r--drivers/acpi/osl.c10
1 files changed, 10 insertions, 0 deletions
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_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
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:
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