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x86: tsc: Prevent delayed init if initial tsc calibration failed

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commit a8760ec (x86: Check tsc available/disabled in the delayed init
function) missed to prevent the setup of the delayed init function in
case the initial tsc calibration failed. This results in the same
divide by zero bug as we have seen without the tsc disabled check.

Skip the delayed work setup when tsc_khz (the initial calibration
value) is 0.

Bisected-and-tested-by: Kirill A. Shutemov <kas@openvz.org>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2011-01-11 11:40:48 +01:00
parent 4aed89d6b5
commit 29fe359ca2
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kernel/tsc.c
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@ -965,7 +965,7 @@ static void tsc_refine_calibration_work(struct work_struct *work)
static int __init init_tsc_clocksource(void)
{
if (!cpu_has_tsc || tsc_disabled > 0)
if (!cpu_has_tsc || tsc_disabled > 0 || !tsc_khz)
return 0;
if (tsc_clocksource_reliable)