[RFC PATCH 5/5] ACPI: EC: Don't count a SCI interrupt as a false one

[Feng Tang <feng.tang@intel.com>]

Currently when advance_transaction() is called in EC interrupt handler,
if there is nothing driver can do with the interrupt, it will be taken
as a false one.

But this is not always true, as there may be a SCI EC interrupt fired
during normal read/write operation, which should not be counted as a
false one. This patch fixes the problem.

Signed-off-by: Feng Tang <feng.tang@intel.com>
---
 drivers/acpi/ec.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 5fc6a55..2afba5b 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -198,9 +198,13 @@ static void advance_transaction(struct acpi_ec *ec, u8 status)
 		t->done = true;
 	goto unlock;
 err:
-	/* false interrupt, state didn't change */
-	if (in_interrupt())
+	/*
+	 * If SCI bit is set, then don't think it's a false IRQ
+	 * otherwise will take a not handled IRQ as a false one.
+	 */
+	if (in_interrupt() && !(status & ACPI_EC_FLAG_SCI))
 		++t->irq_count;
+
 unlock:
 	spin_unlock_irqrestore(&ec->lock, flags);
 }
-- 
1.7.1