ACPI: EC: Check for IBF=0 once again after timeout

From: Alexey Starikovskiy <astarikovskiy@suse.de>

Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
---
 drivers/acpi/ec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 69f5f78..f2902c1 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -318,7 +318,8 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t,
 		}
 	}
 	if (!wait_event_timeout(ec->wait, ec_check_ibf0(ec),
-				msecs_to_jiffies(ACPI_EC_DELAY))) {
+				msecs_to_jiffies(ACPI_EC_DELAY)) &&
+	    !ec_check_ibf0(ec)) {
 		pr_err(PREFIX "input buffer is not empty, "
 				"aborting transaction\n");
 		status = -ETIME;