tree 2878fe886a0cbb5f3fdb2840a11d5acdc73f3523
parent 8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7
author Michael Kelley <mikelley@microsoft.com> 1573713121 +0000
committer Sasha Levin <sashal@kernel.org> 1574385046 -0500

Drivers: hv: vmbus: Fix crash handler reset of Hyper-V synic

The crash handler calls hv_synic_cleanup() to shutdown the
Hyper-V synthetic interrupt controller.  But if the CPU
that calls hv_synic_cleanup() has a VMbus channel interrupt
assigned to it (which is likely the case in smaller VM sizes),
hv_synic_cleanup() returns an error and the synthetic
interrupt controller isn't shutdown.  While the lack of
being shutdown hasn't caused a known problem, it still
should be fixed for highest reliability.

So directly call hv_synic_disable_regs() instead of
hv_synic_cleanup(), which ensures that the synic is always
shutdown.

Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>