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authorMichael Kelley2019-11-14 06:32:01 +0000
committerSasha Levin2019-11-21 20:10:46 -0500
commit7a1323b5dfe44a9013a2cc56ef2973034a00bf88 (patch)
tree2878fe886a0cbb5f3fdb2840a11d5acdc73f3523
parent8aea7f82153d6f292add3eb4bd7ba8edcae5c7f7 (diff)
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>
-rw-r--r--drivers/hv/vmbus_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 845d2a9423ea..f3d0bddc80a7 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -2310,7 +2310,7 @@ static void hv_crash_handler(struct pt_regs *regs)
vmbus_connection.conn_state = DISCONNECTED;
cpu = smp_processor_id();
hv_stimer_cleanup(cpu);
- hv_synic_cleanup(cpu);
+ hv_synic_disable_regs(cpu);
hyperv_cleanup();
};