From a3cd8d2789c2e265e09377f260e7d2ac9cec81bb Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Tue, 23 Oct 2012 01:30:12 +0200 Subject: [PATCH] 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 Signed-off-by: Rafael J. Wysocki --- drivers/acpi/ec.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 8f8b644bba8d..354007d490d1 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); } -- 2.30.2