linux-kernel - [PATCH 3/3] PCI: Cleanup pci_scan_child_bus

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Message-Id: <20250610105820.7126-3-ilpo.jarvinen@linux.intel.com>
Date: Tue, 10 Jun 2025 13:58:20 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Krzysztof Wilczyński <kw@...ux.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 3/3] PCI: Cleanup pci_scan_child_bus_extend() loop

pci_scan_child_bus_extend() open-codes device number iteration in the
for loop. Convert to use PCI_DEVFN() and add PCI_MAX_NR_DEVS (there
seems to be no pre-existing defines for this purpose).

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 drivers/pci/pci.h   | 1 +
 drivers/pci/probe.c | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 12215ee72afb..caa6e02a9aea 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -8,6 +8,7 @@ struct pcie_tlp_log;
 
 /* Number of possible devfns: 0.0 to 1f.7 inclusive */
 #define MAX_NR_DEVFNS 256
+#define PCI_MAX_NR_DEVS	32
 
 #define MAX_NR_LANES 16
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index f08e754c404b..963cab481327 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3029,14 +3029,14 @@ static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus,
 {
 	unsigned int used_buses, normal_bridges = 0, hotplug_bridges = 0;
 	unsigned int start = bus->busn_res.start;
-	unsigned int devfn, cmax, max = start;
+	unsigned int devnr, cmax, max = start;
 	struct pci_dev *dev;
 
 	dev_dbg(&bus->dev, "scanning bus\n");
 
 	/* Go find them, Rover! */
-	for (devfn = 0; devfn < 256; devfn += 8)
-		pci_scan_slot(bus, devfn);
+	for (devnr = 0; devnr < PCI_MAX_NR_DEVS; devnr++)
+		pci_scan_slot(bus, PCI_DEVFN(devnr, 0));
 
 	/* Reserve buses for SR-IOV capability */
 	used_buses = pci_iov_bus_range(bus);
-- 
2.39.5