From: Sean V Kelley <sean.v.kelley@intel.com>
Date: Fri, 20 Nov 2020 16:10:28 -0800
Subject: PCI/ERR: Use "bridge" for clarity in pcie_do_recovery()
Git-commit: 0791721d800790e6e533bd8467df67f0dc4f2fec
Patch-mainline: v5.11-rc1
References: bsc#1174426

pcie_do_recovery() may be called with "dev" being either a bridge (Root
Port or Switch Downstream Port) or an Endpoint.  The bulk of the function
deals with the bridge, so if we start with an Endpoint, we reset "dev" to
be the bridge leading to it.

For clarity, replace "dev" in the body of the function with "bridge".  No
functional change intended.

Link: https://lore.kernel.org/r/20201121001036.8560-8-sean.v.kelley@intel.com
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # non-native/no RCEC
Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Joerg Roedel <jroedel@suse.de>
---
 drivers/pci/pcie/err.c |   37 ++++++++++++++++++++-----------------
 1 file changed, 20 insertions(+), 17 deletions(-)

--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -147,24 +147,27 @@ pci_ers_result_t pcie_do_recovery(struct
 		pci_ers_result_t (*reset_subordinates)(struct pci_dev *pdev))
 {
 	int type = pci_pcie_type(dev);
-	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
+	struct pci_dev *bridge;
 	struct pci_bus *bus;
+	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
 
 	/*
-	 * Error recovery runs on all subordinates of the first downstream port.
-	 * If the downstream port detected the error, it is cleared at the end.
+	 * Error recovery runs on all subordinates of the bridge.  If the
+	 * bridge detected the error, it is cleared at the end.
 	 */
 	if (!(type == PCI_EXP_TYPE_ROOT_PORT ||
 	      type == PCI_EXP_TYPE_DOWNSTREAM))
-		dev = pci_upstream_bridge(dev);
-	bus = dev->subordinate;
+		bridge = pci_upstream_bridge(dev);
+	else
+		bridge = dev;
 
-	pci_dbg(dev, "broadcast error_detected message\n");
+	bus = bridge->subordinate;
+	pci_dbg(bridge, "broadcast error_detected message\n");
 	if (state == pci_channel_io_frozen) {
 		pci_walk_bus(bus, report_frozen_detected, &status);
-		status = reset_subordinates(dev);
+		status = reset_subordinates(bridge);
 		if (status != PCI_ERS_RESULT_RECOVERED) {
-			pci_warn(dev, "subordinate device reset failed\n");
+			pci_warn(bridge, "subordinate device reset failed\n");
 			goto failed;
 		}
 	} else {
@@ -173,7 +176,7 @@ pci_ers_result_t pcie_do_recovery(struct
 
 	if (status == PCI_ERS_RESULT_CAN_RECOVER) {
 		status = PCI_ERS_RESULT_RECOVERED;
-		pci_dbg(dev, "broadcast mmio_enabled message\n");
+		pci_dbg(bridge, "broadcast mmio_enabled message\n");
 		pci_walk_bus(bus, report_mmio_enabled, &status);
 	}
 
@@ -184,27 +187,27 @@ pci_ers_result_t pcie_do_recovery(struct
 		 * drivers' slot_reset callbacks?
 		 */
 		status = PCI_ERS_RESULT_RECOVERED;
-		pci_dbg(dev, "broadcast slot_reset message\n");
+		pci_dbg(bridge, "broadcast slot_reset message\n");
 		pci_walk_bus(bus, report_slot_reset, &status);
 	}
 
 	if (status != PCI_ERS_RESULT_RECOVERED)
 		goto failed;
 
-	pci_dbg(dev, "broadcast resume message\n");
+	pci_dbg(bridge, "broadcast resume message\n");
 	pci_walk_bus(bus, report_resume, &status);
 
-	if (pcie_aer_is_native(dev))
-		pci_aer_clear_device_status(dev);
-	pci_aer_clear_nonfatal_status(dev);
-	pci_info(dev, "AER: Device recovery successful\n");
+	if (pcie_aer_is_native(bridge))
+		pci_aer_clear_device_status(bridge);
+	pci_aer_clear_nonfatal_status(bridge);
+	pci_info(bridge, "device recovery successful\n");
 	return status;
 
 failed:
-	pci_uevent_ers(dev, PCI_ERS_RESULT_DISCONNECT);
+	pci_uevent_ers(bridge, PCI_ERS_RESULT_DISCONNECT);
 
 	/* TODO: Should kernel panic here? */
-	pci_info(dev, "AER: Device recovery failed\n");
+	pci_info(bridge, "AER: device recovery failed\n");
 
 	return status;
 }