linux-kernel - [RFC PATCH v4] ACPICA/Events: Add support to ensure GPE is disabled by default for handlers.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <ce3ab540463bc5d97e527f24ca7d7d82b2952fae.1416459350.git.lv.zheng@intel.com>
Date:	Thu, 20 Nov 2014 14:44:59 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: [RFC PATCH v4] ACPICA/Events: Add support to ensure GPE is disabled by default for handlers.

On some platforms, GPE is not disabled by default after ACPI hardware is
enabled. This confuses GPE drivers. This patch adds support to disable GPE
by default for GPE handler drivers.

Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Cc: Kirill A. Shutemov <kirill@...temov.name>
---
 drivers/acpi/acpica/evxface.c |    7 +++++++
 1 file changed, 7 insertions(+)

Index: linux-acpica/drivers/acpi/acpica/evxface.c
===================================================================
--- linux-acpica.orig/drivers/acpi/acpica/evxface.c
+++ linux-acpica/drivers/acpi/acpica/evxface.c
@@ -821,6 +821,14 @@ acpi_install_gpe_handler(acpi_handle gpe
 	    ~(ACPI_GPE_XRUPT_TYPE_MASK | ACPI_GPE_DISPATCH_MASK);
 	gpe_event_info->flags |= (u8)(type | ACPI_GPE_DISPATCH_HANDLER);
 
+	/*
+	 * Make sure that the GPE is disabled by default for the GPE
+	 * handler driver. It is expected that the GPE handler driver
+	 * should invoke acpi_enable_gpe() after installing the GPE
+	 * handler.
+	 */
+	(void)acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_DISABLE);
+
 	acpi_os_release_lock(acpi_gbl_gpe_lock, flags);
 
 unlock_and_exit:
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/