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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>
This commit is contained in:
Feng Tang 2012-10-23 01:30:12 +02:00 committed by Rafael J. Wysocki
parent b76b51ba0c
commit a3cd8d2789
1 changed files with 6 additions and 2 deletions
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8
drivers/acpi/ec.c
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@ -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);
}