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ACPI: Use GPE reference counting to support shared GPEs

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To fix a bug and address the reviewers' comments regarding the ACPI
GPE refcounting patch, do the following additional changes:

o Remove the second argument of acpi_ev_enable_gpe(),
  'write_to_hardware', because it is not necessary any more.

o Add the "bad parameter" test against 'type' in
  acpi_enable_gpe() and acpi_disable_gpe().

o Make acpi_enable_gpe() only check 'status' for runtime GPEs if
  acpi_ev_enable_gpe() was actually called.

o Make acpi_disable_gpe() return 'status' returned by
  acpi_ev_disable_gpe() and fix a bug where ACPI_GPE_TYPE_WAKE
  and ACPI_GPE_TYPE_RUNTIME were exchanged by mistake.

o Add comments explaining why acpi_set_gpe() is used by the ACPI EC
  driver.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Rafael J. Wysocki
2010-02-24 00:52:08 +01:00
committed by Jesse Barnes
parent 7bc5e3f2be
commit cbbc0de700
4 changed files with 30 additions and 22 deletions
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14
drivers/acpi/ec.c
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@@ -307,6 +307,10 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
pr_debug(PREFIX "transaction start\n");
/* disable GPE during transaction if storm is detected */
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
/*
* It has to be disabled at the hardware level regardless of the
* GPE reference counting, so that it doesn't trigger.
*/
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
}
@@ -316,7 +320,11 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
ec_check_sci_sync(ec, acpi_ec_read_status(ec));
if (test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) {
msleep(1);
/* it is safe to enable GPE outside of transaction */
/*
* It is safe to enable the GPE outside of the transaction. Use
* acpi_set_gpe() for that, since we used it to disable the GPE
* above.
*/
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
} else if (t->irq_count > ACPI_EC_STORM_THRESHOLD) {
pr_info(PREFIX "GPE storm detected, "
@@ -1059,7 +1067,7 @@ error:
static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
{
struct acpi_ec *ec = acpi_driver_data(device);
/* Stop using GPE */
/* Stop using the GPE, but keep it reference counted. */
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
return 0;
}
@@ -1067,7 +1075,7 @@ static int acpi_ec_suspend(struct acpi_device *device, pm_message_t state)
static int acpi_ec_resume(struct acpi_device *device)
{
struct acpi_ec *ec = acpi_driver_data(device);
/* Enable use of GPE back */
/* Enable the GPE again, but don't reference count it once more. */
acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE);
return 0;
}