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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-01-14 09:47:26 -0800
committerThomas Gleixner <tglx@linutronix.de>2011-01-21 17:38:19 +0100
commitdb6b175fa6ad1408cbb2fb62949a6d55cfece03e (patch)
treef24a18a63b7f7bab192d30c0b1e8500cb75a38b5 /drivers/clocksource
parent1daeddd5962acad1bea55e524fc0fadf32654a21 (diff)
downloadlinux-db6b175fa6ad1408cbb2fb62949a6d55cfece03e.tar.bz2
acpi_pm: Clear pmtmr_ioport if acpi_pm initialization fails
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. ] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <1295027246-11110-1-git-send-email-johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/acpi_pm.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index cfb0f5278415..effe7974aa9a 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);