From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sinan Kaya Subject: [PATCH 1/2] IB/hfi1: Try slot reset before secondary bus reset Date: Thu, 19 Apr 2018 15:56:23 -0400 Message-ID: <1524167784-5911-1-git-send-email-okaya@codeaurora.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-pci@vger.kernel.org, sulrich@codeaurora.org, timur@codeaurora.org Cc: linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Sinan Kaya , Mike Marciniszyn , Dennis Dalessandro , Doug Ledford , Jason Gunthorpe , "open list:HFI1 DRIVER" , open list List-Id: linux-rdma@vger.kernel.org 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 --- 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