Commit 3ccb4fd8 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Greg Kroah-Hartman

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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 41571916
...@@ -295,8 +295,14 @@ void hv_cleanup(void) ...@@ -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);
......
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