linux-kernel - [PATCH v8 05/14] PCI/ERR: Use "bridge" for clarity in pcie_do

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Date:   Fri,  2 Oct 2020 11:47:26 -0700
From:   Sean V Kelley <seanvk.dev@...gontracks.org>
To:     bhelgaas@...gle.com, Jonathan.Cameron@...wei.com,
        rafael.j.wysocki@...el.com, ashok.raj@...el.com,
        tony.luck@...el.com, sathyanarayanan.kuppuswamy@...el.com,
        qiuxu.zhuo@...el.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean V Kelley <sean.v.kelley@...el.com>
Subject: [PATCH v8 05/14] PCI/ERR: Use "bridge" for clarity in pcie_do_recovery()

From: Sean V Kelley <sean.v.kelley@...el.com>

A generic term such as "bridge" may be used for something with
a subordinate bus. The mix of ports would benefit from a use of
the term. Further clarity can be had in pcie_do_recovery()
with use of pci_upstream_bridge() in place of dev->bus->self.
Reverse the pcie_do_recovery() conditional logic and replace
use of "dev" with "bridge".

Suggested-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Sean V Kelley <sean.v.kelley@...el.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 drivers/pci/pcie/err.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 950612342f1c..e68ea5243ff2 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -152,20 +152,26 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 {
 	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
 	struct pci_bus *bus;
+	struct pci_dev *bridge;
+	int type;
 
 	/*
-	 * 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 first downstream
+	 * bridge. If the downstream bridge detected the error, it is
+	 * cleared at the end.
 	 */
-	if (!(pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT ||
-	      pci_pcie_type(dev) == PCI_EXP_TYPE_DOWNSTREAM))
-		dev = dev->bus->self;
-	bus = dev->subordinate;
-
+	type = pci_pcie_type(dev);
+	if (type == PCI_EXP_TYPE_ROOT_PORT ||
+	    type == PCI_EXP_TYPE_DOWNSTREAM)
+		bridge = dev;
+	else
+		bridge = pci_upstream_bridge(dev);
+
+	bus = bridge->subordinate;
 	pci_dbg(dev, "broadcast error_detected message\n");
 	if (state == pci_channel_io_frozen) {
 		pci_walk_bus(bus, report_frozen_detected, &status);
-		status = reset_subordinate_device(dev);
+		status = reset_subordinate_device(bridge);
 		if (status != PCI_ERS_RESULT_RECOVERED) {
 			pci_warn(dev, "subordinate device reset failed\n");
 			goto failed;
@@ -197,9 +203,9 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 	pci_dbg(dev, "broadcast resume message\n");
 	pci_walk_bus(bus, report_resume, &status);
 
-	if (pcie_aer_is_native(dev))
-		pcie_clear_device_status(dev);
-	pci_aer_clear_nonfatal_status(dev);
+	if (pcie_aer_is_native(bridge))
+		pcie_clear_device_status(bridge);
+	pci_aer_clear_nonfatal_status(bridge);
 	pci_info(dev, "device recovery successful\n");
 	return status;
 
-- 
2.28.0