linux-kernel - [PATCH 23/85] ACPI: Clear WAK

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]

Date:	Sat, 11 Oct 2008 02:35:43 -0400
From:	Len Brown <lenb@...nel.org>
To:	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Matthew Garrett <mjg@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Len Brown <len.brown@...el.com>
Subject: [PATCH 23/85] ACPI: Clear WAK_STS on resume

From: Matthew Garrett <mjg59@...f.ucam.org>

The leading other brand OS appears to clear the WAK_STS flag on resume.
When rebooted, certain BIOSes assume that the system is actually
resuming if it's still set and so fail to reboot correctly. Make sure
that it's cleared at resume time.

Comment clarified as suggested by Bob Moore

Signed-off-by: Matthew Garrett <mjg@...hat.com>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Len Brown <len.brown@...el.com>
---
 drivers/acpi/hardware/hwsleep.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
index dba3cfb..130a44b 100644
--- a/drivers/acpi/hardware/hwsleep.c
+++ b/drivers/acpi/hardware/hwsleep.c
@@ -627,6 +627,13 @@ acpi_status acpi_leave_sleep_state(u8 sleep_state)
 	}
 	/* TBD: _WAK "sometimes" returns stuff - do we want to look at it? */
 
+	/*
+	 * Some BIOSes assume that WAK_STS will be cleared on resume and use
+	 * it to determine whether the system is rebooting or resuming. Clear
+	 * it for compatibility.
+	 */
+	acpi_set_register(ACPI_BITREG_WAKE_STATUS, 1);
+
 	acpi_gbl_system_awake_and_running = TRUE;
 
 	/* Enable power button */
-- 
1.5.5.1

--
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/