linux-kernel - [PATCH] acpi_pm: Clear pmtmr_ioport if acpi

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Message-Id: <1295027246-11110-1-git-send-email-johnstul@us.ibm.com>
Date:	Fri, 14 Jan 2011 09:47:26 -0800
From:	John Stultz <johnstul@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>
Subject: [PATCH] acpi_pm: Clear pmtmr_ioport if acpi_pm initialization fails

From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

If the acpi pm timer throws invalid data, clear pmtmr_ioport
so the pm timer won't accidentally be used.

This was found when using Xen where there is a acpi pm reported,
but gives bogus values, and other code was continuing to try
to use the pm timer after the initialization failed.

[jstultz: Catch additional failure and reword changelog message. ]

CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC: Thomas Gleixner <tglx@...utronix.de>
Reported-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: John Stultz <johnstul@...ibm.com>
---
 drivers/clocksource/acpi_pm.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index cfb0f52..effe797 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -202,17 +202,21 @@ static int __init init_acpi_pm_clocksource(void)
 			printk(KERN_INFO "PM-Timer had inconsistent results:"
 			       " 0x%#llx, 0x%#llx - aborting.\n",
 			       value1, value2);
+			pmtmr_ioport = 0;
 			return -EINVAL;
 		}
 		if (i == ACPI_PM_READ_CHECKS) {
 			printk(KERN_INFO "PM-Timer failed consistency check "
 			       " (0x%#llx) - aborting.\n", value1);
+			pmtmr_ioport = 0;
 			return -ENODEV;
 		}
 	}
 
-	if (verify_pmtmr_rate() != 0)
+	if (verify_pmtmr_rate() != 0){
+		pmtmr_ioport = 0;
 		return -ENODEV;
+	}
 
 	return clocksource_register_hz(&clocksource_acpi_pm,
 						PMTMR_TICKS_PER_SEC);
-- 
1.7.3.2.146.gca209

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