linux-kernel - [PATCH] PCI: host-generic: Set driver_data before calling gen_pci

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Message-ID: <774290708a6f0f683711914fda110742c18a7fb2.1750787223.git.geert+renesas@glider.be>
Date: Tue, 24 Jun 2025 19:50:10 +0200
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Marc Zyngier <maz@...nel.org>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Rob Herring <robh@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Will Deacon <will@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Conor Dooley <conor.dooley@...rochip.com>,
	Daire McNamara <daire.mcnamara@...rochip.com>
Cc: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] PCI: host-generic: Set driver_data before calling gen_pci_init()

On MicroChip MPFS Icicle:

    microchip-pcie 2000000000.pcie: host bridge /soc/pcie@...0000000 ranges:
    microchip-pcie 2000000000.pcie: Parsing ranges property...
    microchip-pcie 2000000000.pcie:      MEM 0x2008000000..0x2087ffffff -> 0x0008000000
    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000368
    Current swapper/0 pgtable: 4K pagesize, 39-bit VAs, pgdp=0x00000000814f1000
    [0000000000000368] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000
    Oops [#1]
    Modules linked in:
    CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.15.0-rc1-icicle-00003-gafc0a570bb61 #232 NONE
    Hardware name: Microchip PolarFire-SoC Icicle Kit (DT)
    [...]
    [<ffffffff803fb8a4>] plda_pcie_setup_iomems+0xe/0x78
    [<ffffffff803fc246>] mc_platform_init+0x80/0x1d2
    [<ffffffff803f9c88>] pci_ecam_create+0x104/0x1e2
    [<ffffffff8000adbe>] pci_host_common_init+0x120/0x228
    [<ffffffff8000af42>] pci_host_common_probe+0x7c/0x8a

The initialization of driver_data was moved after the call to
gen_pci_init(), while the pci_ecam_ops.init() callback
mc_platform_init() expects it has already been initialized.

Fix this by moving the initialization of driver_data up.

Fixes: afc0a570bb613871 ("PCI: host-generic: Extract an ECAM bridge creation helper from pci_host_common_probe()")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Notes:
  1. Before, driver_data was initialized before calling
     of_pci_check_probe_only(), but the latter doesn't rely on that,
  2. drivers/pci/controller/plda/pcie-microchip-host.c seems to be the
     only driver relying on driver_data being set.
---
 drivers/pci/controller/pci-host-common.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
index b0992325dd65f0da..b37052863847162d 100644
--- a/drivers/pci/controller/pci-host-common.c
+++ b/drivers/pci/controller/pci-host-common.c
@@ -64,13 +64,13 @@ int pci_host_common_init(struct platform_device *pdev,
 
 	of_pci_check_probe_only();
 
+	platform_set_drvdata(pdev, bridge);
+
 	/* Parse and map our Configuration Space windows */
 	cfg = gen_pci_init(dev, bridge, ops);
 	if (IS_ERR(cfg))
 		return PTR_ERR(cfg);
 
-	platform_set_drvdata(pdev, bridge);
-
 	bridge->sysdata = cfg;
 	bridge->ops = (struct pci_ops *)&ops->pci_ops;
 	bridge->enable_device = ops->enable_device;
-- 
2.43.0