linux-kernel - [PATCH][Regression fix] ACPI / ACPICA: Do not attempt to disable GPE when installing handler

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Message-Id: <201006120005.19807.rjw@sisk.pl>
Date:	Sat, 12 Jun 2010 00:05:19 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Len Brown <lenb@...nel.org>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Matthew Garrett <mjg@...hat.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	"Moore, Robert" <robert.moore@...el.com>, len.brown@...el.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH][Regression fix]  ACPI / ACPICA: Do not attempt to disable GPE when installing handler

From: Rafael J. Wysocki <rjw@...k.pl>

Commit 0f849d2cc6863c7874889ea60a871fb71399dd3f (ACPICA: Minimize
the differences between linux GPE code and ACPICA code base)
introduced a change attempting to disable a GPE before installing
a handler for it in acpi_install_gpe_handler() which was incorrect.
First, the GPE disabled by it is never enabled again (except during
resume) which leads to battery insert/remove events not being
reported on the Maxim Levitsky's machine.  Second, the disabled
GPE is still reported as enabled by the sysfs interface that only
checks its enable register's enable_for_run mask.

Revert this change for now, because it causes more damage to happen
than the bug it was supposed to fix.

Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Reported-and-tested-by: Maxim Levitsky <maximlevitsky@...il.com>
---
Hi Len,

This will conflict with
http://git.kernel.org/?p=linux/kernel/git/lenb/linux-acpi-2.6.git;a=commit;h=a771b5f7b5b132fc3e653645405e20abb4da6e8c
but the conflict is easy to resolve.

Please apply.

Rafael
---
 drivers/acpi/acpica/evxface.c |   20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

Index: linux-2.6/drivers/acpi/acpica/evxface.c
===================================================================
--- linux-2.6.orig/drivers/acpi/acpica/evxface.c
+++ linux-2.6/drivers/acpi/acpica/evxface.c
@@ -719,13 +720,6 @@ acpi_install_gpe_handler(acpi_handle gpe
 	handler->context = context;
 	handler->method_node = gpe_event_info->dispatch.method_node;

-	/* Disable the GPE before installing the handler */
-
-	status = acpi_ev_disable_gpe(gpe_event_info);
-	if (ACPI_FAILURE (status)) {
-		goto unlock_and_exit;
-	}
-
 	/* Install the handler */

 	flags = acpi_os_acquire_lock(acpi_gbl_gpe_lock);
--
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