linux-kernel - [PATCH 2/2] IB/hfi1: Remove pci_parent_bus

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Date:   Tue, 20 Jun 2023 10:49:20 +0100 (BST)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>
cc:     linux-pci@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] IB/hfi1: Remove pci_parent_bus_reset() duplication

Call pci_parent_bus_reset() rather than duplicating it in trigger_sbr().
There are extra preparatory checks made by the former function, but they 
are supposed to be neutral to the HFI1 device.

Signed-off-by: Maciej W. Rozycki <macro@...am.me.uk>
---
 drivers/infiniband/hw/hfi1/pcie.c |   30 ++++--------------------------
 1 file changed, 4 insertions(+), 26 deletions(-)

linux-ib-hfi1-pcie-sbr-parent-bus-reset.diff
Index: linux-macro/drivers/infiniband/hw/hfi1/pcie.c
===================================================================
--- linux-macro.orig/drivers/infiniband/hw/hfi1/pcie.c
+++ linux-macro/drivers/infiniband/hw/hfi1/pcie.c
@@ -796,35 +796,13 @@ static void pcie_post_steps(struct hfi1_
 /*
  * Trigger a secondary bus reset (SBR) on ourselves using our parent.
  *
- * Based on pci_parent_bus_reset() which is not exported by the
- * kernel core.
+ * This is an end around to do an SBR during probe time.  A new API
+ * needs to be implemented to have cleaner interface but this fixes
+ * the current brokenness.
  */
 static int trigger_sbr(struct hfi1_devdata *dd)
 {
-	struct pci_dev *dev = dd->pcidev;
-	struct pci_dev *pdev;
-
-	/* need a parent */
-	if (!dev->bus->self) {
-		dd_dev_err(dd, "%s: no parent device\n", __func__);
-		return -ENOTTY;
-	}
-
-	/* should not be anyone else on the bus */
-	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
-		if (pdev != dev) {
-			dd_dev_err(dd,
-				   "%s: another device is on the same bus\n",
-				   __func__);
-			return -ENOTTY;
-		}
-
-	/*
-	 * This is an end around to do an SBR during probe time. A new API needs
-	 * to be implemented to have cleaner interface but this fixes the
-	 * current brokenness
-	 */
-	return pci_bridge_secondary_bus_reset(dev->bus->self);
+	return pci_parent_bus_reset(dd->pcidev, PCI_RESET_DO_RESET);
 }
 
 /*