The pci-hyperv driver's channel callback hv_pci_onchannelcallback() is not
really a hot path, so we don't need to mark it as a perf_device, meaning
with this patch all HV_PCIE channels' target_cpu will be CPU0.
This patch can help to avoid a potential ABBA deadlock in the busy loop
of Hyper-V PCI driver's hv_compose_msi_msg().
Signed-off-by: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
---
drivers/hv/channel_mgmt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index c21020b69114..55ee5e87073a 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -71,7 +71,7 @@ static const struct vmbus_device vmbus_devs[] = {
/* PCIE */
{ .dev_type = HV_PCIE,
HV_PCIE_GUID,
- .perf_device = true,
+ .perf_device = false,
},
/* Synthetic Frame Buffer */
--
2.7.4