[PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset

[Sinan Kaya]

The infiniband adapter might be connected to a PCI hotplug slot. Performing
secondary bus reset on a hotplug slot causes PCI link up/down interrupts.

Hotplug driver removes the device from system when a link down interrupt
is observed and performs re-enumeration when link up interrupt is observed.

This conflicts with what this code is trying to do. Try secondary bus reset
only if pci_reset_slot() fails/unsupported.

Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
---
 drivers/infiniband/hw/hfi1/pcie.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c
index 83d66e8..75f49e3 100644
--- a/drivers/infiniband/hw/hfi1/pcie.c
+++ b/drivers/infiniband/hw/hfi1/pcie.c
@@ -908,7 +908,8 @@ static int trigger_sbr(struct hfi1_devdata *dd)
 	 * delay after a reset is required.  Per spec requirements,
 	 * the link is either working or not after that point.
 	 */
-	pci_reset_bridge_secondary_bus(dev->bus->self);
+	if (pci_reset_slot(dev->slot))
+		pci_reset_bridge_secondary_bus(dev->bus->self);
 
 	return 0;
 }
-- 
2.7.4