linux-kernel - [PATCH v2] PCI: apple: Set only available ports up

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Date:   Thu, 09 Mar 2023 14:36:24 +0100
From:   Janne Grunau <j@...nau.net>
To:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Sven Peter <sven@...npeter.dev>, linux-pci@...r.kernel.org,
        asahi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Janne Grunau <j@...nau.net>
Subject: [PATCH v2] PCI: apple: Set only available ports up

Fixes following warning inside of_irq_parse_raw() called from the common
PCI device probe path.

  /soc/pcie@...000000/pci@1,0 interrupt-map failed, using interrupt-controller
  WARNING: CPU: 4 PID: 252 at drivers/of/irq.c:279 of_irq_parse_raw+0x5fc/0x724
  ...
  Call trace:
   of_irq_parse_raw+0x5fc/0x724
   of_irq_parse_and_map_pci+0x128/0x1d8
   pci_assign_irq+0xc8/0x140
   pci_device_probe+0x70/0x188
   really_probe+0x178/0x418
   __driver_probe_device+0x120/0x188
   driver_probe_device+0x48/0x22c
   __device_attach_driver+0x134/0x1d8
   bus_for_each_drv+0x8c/0xd8
   __device_attach+0xdc/0x1d0
   device_attach+0x20/0x2c
   pci_bus_add_device+0x5c/0xc0
   pci_bus_add_devices+0x58/0x88
   pci_host_probe+0x124/0x178
   pci_host_common_probe+0x124/0x198 [pci_host_common]
   apple_pcie_probe+0x108/0x16c [pcie_apple]
   platform_probe+0xb4/0xdc

This became apparent after disabling unused PCIe ports in the Apple
silicon device trees instead of deleting them.

Use for_each_available_child_of_node instead of for_each_child_of_node
which takes the "status" property into account.

Link: https://lore.kernel.org/asahi/20230214-apple_dts_pcie_disable_unused-v1-0-5ea0d3ddcde3@jannau.net/
Link: https://lore.kernel.org/asahi/1ea2107a-bb86-8c22-0bbc-82c453ab08ce@linaro.org/
Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
Cc: stable@...r.kernel.org
Reviewed-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Janne Grunau <j@...nau.net>
---
Changes in v2:
- rewritten commit message with more details and corrections
- collected Marc's "Reviewed-by:"
- Link to v1: https://lore.kernel.org/r/20230307-apple_pcie_disabled_ports-v1-1-b32ef91faf19@jannau.net
---
 drivers/pci/controller/pcie-apple.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
index 66f37e403a09..f8670a032f7a 100644
--- a/drivers/pci/controller/pcie-apple.c
+++ b/drivers/pci/controller/pcie-apple.c
@@ -783,7 +783,7 @@ static int apple_pcie_init(struct pci_config_window *cfg)
 	cfg->priv = pcie;
 	INIT_LIST_HEAD(&pcie->ports);

-	for_each_child_of_node(dev->of_node, of_port) {
+	for_each_available_child_of_node(dev->of_node, of_port) {
 		ret = apple_pcie_setup_port(pcie, of_port);
 		if (ret) {
 			dev_err(pcie->dev, "Port %pOF setup fail: %d\n", of_port, ret);

---
base-commit: c9c3395d5e3dcc6daee66c6908354d47bf98cb0c
change-id: 20230307-apple_pcie_disabled_ports-0c17fb7a4738

Best regards,
-- 
Janne Grunau <j@...nau.net>