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x86: Do not try to disable hpet if it hasn't been initialized before 

hpet_disable is called unconditionally on machine reboot if hpet support
is compiled in the kernel.
hpet_disable only checks if the machine is hpet capable but doesn't make
sure that hpet has been initialized.

[ tglx: Made it a one liner and removed the redundant hpet_address check ]

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Venkatesh Pallipadi <venki@google.com>
LKML-Reference: <alpine.DEB.2.00.1007211726240.22235@kaball-desktop>
Cc: stable@kernel.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Stefano Stabellini 2010-07-21 18:32:37 +01:00 committed by Thomas Gleixner
parent 087b255a2b
commit ff4878089e
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/hpet.c
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@ -964,7 +964,7 @@ fs_initcall(hpet_late_init);
void hpet_disable(void)
{
if (is_hpet_capable()) {
if (is_hpet_capable() && hpet_virt_address) {
unsigned int cfg = hpet_readl(HPET_CFG);
if (hpet_legacy_int_enabled) {