From: Thomas Gleixner Date: Tue, 11 Jan 2011 10:40:48 +0000 (+0100) Subject: x86: tsc: Prevent delayed init if initial tsc calibration failed X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=29fe359ca20326e57b25e8545c49ed9ff5e830c7;p=linux-beck.git x86: tsc: Prevent delayed init if initial tsc calibration failed 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 Cc: John Stultz Signed-off-by: Thomas Gleixner --- diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c index 356a0d455cf9..463901efdba4 100644 --- a/arch/x86/kernel/tsc.c +++ b/arch/x86/kernel/tsc.c @@ -965,7 +965,7 @@ out: 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)