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Commit 3ccb4fd8 authored Jan 27, 2016 by Vitaly Kuznetsov Committed by Greg Kroah-Hartman Feb 07, 2016

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>

parent 41571916

drivers/hv/hv.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -295,8 +295,14 @@ void hv_cleanup(void)
		* Cleanup the TSC page based CS.
		*/
		if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
		/*
		* 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;
		wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);