ACPI: Avoid bogus timeout about SMbus check

In the function of wait_transaction_complete when the timeout happens,
OS will try to check the status of SMbus again. If the status is what OS
expected, it will be regarded as the bogus timeout. Otherwise it will be
treated as ETIME.

http://bugzilla.kernel.org/show_bug.cgi?id=10483

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
tested-by    : Oldřich Jedlička < <oldium.pro@seznam.cz>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/drivers/acpi/sbshc.c b/drivers/acpi/sbshc.c
index bcf2c70fca87f498b9a3c5af5e0037248c488b37..a4e3767b8c64241c6bd1c11010f0c2001fd7e7c1 100644 (file)
--- a/drivers/acpi/sbshc.c
+++ b/drivers/acpi/sbshc.c
@@ -107,6 +107,13 @@ static int wait_transaction_complete(struct acpi_smb_hc *hc, int timeout)
        if (wait_event_timeout(hc->wait, smb_check_done(hc),
                               msecs_to_jiffies(timeout)))
                return 0;
+       /*
+        * After the timeout happens, OS will try to check the status of SMbus.
+        * If the status is what OS expected, it will be regarded as the bogus
+        * timeout.
+        */
+       if (smb_check_done(hc))
+               return 0;
        else
                return -ETIME;
 }