ACPI: EC: Use a threaded handler for dedicated IRQ

After commit 7a36b901 ("ACPI: OSL: Use a threaded interrupt handler
for SCI") all of the EC code runs in thread context on all systems where
EC events are signaled through a GPE.

It may as well run in thread context on systems using a dedicated IRQ
for EC events signaling, so make it use a threaded handler for that IRQ.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/ec.c

@@ -1458,8 +1458,8 @@ static bool install_gpe_event_handler(struct acpi_ec *ec)
 
 static bool install_gpio_irq_event_handler(struct acpi_ec *ec)
 {
-	return request_irq(ec->irq, acpi_ec_irq_handler, IRQF_SHARED,
-			   "ACPI EC", ec) >= 0;
+	return request_threaded_irq(ec->irq, NULL, acpi_ec_irq_handler,
+				    IRQF_SHARED | IRQF_ONESHOT, "ACPI EC", ec) >= 0;
 }
 
 /**