[ACPI] fix acpi_os_wait_sempahore() finite timeout case (AE_TIME warning)

Before this fix, the finite timeout case
behaved like the no-timeout (trylock) case.

http://bugzilla.kernel.org/show_bug.cgi?id=4588

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index e3cd0b16031a..8653dac01a76 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -836,7 +836,7 @@ acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout)
                         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);
                         }