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

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Message-Id: <1524167784-5911-1-git-send-email-okaya@codeaurora.org>
Date:   Thu, 19 Apr 2018 15:56:23 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     linux-pci@...r.kernel.org, sulrich@...eaurora.org,
        timur@...eaurora.org
Cc:     linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Sinan Kaya <okaya@...eaurora.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        linux-rdma@...r.kernel.org (open list:HFI1 DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset

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@...eaurora.org>
---
 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