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Drivers: hv: vmbus: don't manipulate with clocksources on crash 

clocksource_change_rating() involves mutex usage and can't be called
in interrupt context. It also makes sense to avoid doing redundant work
on crash.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2016-01-27 22:29:36 -08:00 committed by Greg Kroah-Hartman
parent 415719160d
commit 3ccb4fd8f4
1 changed files with 8 additions and 2 deletions
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10
drivers/hv/hv.c
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@ -295,8 +295,14 @@ void hv_cleanup(void)
* Cleanup the TSC page based CS. * Cleanup the TSC page based CS.
*/ */
if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) { if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
clocksource_change_rating(&hyperv_cs_tsc, 10); /*
clocksource_unregister(&hyperv_cs_tsc); * Crash can happen in an interrupt context and unregistering
* a clocksource is impossible and redundant in this case.
*/
if (!oops_in_progress) {
clocksource_change_rating(&hyperv_cs_tsc, 10);
clocksource_unregister(&hyperv_cs_tsc);
}
hypercall_msr.as_uint64 = 0; hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64); wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);