ACPI / EC: Don't count a SCI interrupt as a false one
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>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 8f8b644..354007d 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -198,9 +198,13 @@
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);
}