linux-kernel - [PATCH v4 3/4] PCI: keystone: Exit ks_pcie

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Message-ID: <20251022095724.997218-4-s-vadapalli@ti.com>
Date: Wed, 22 Oct 2025 15:27:11 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <lpieralisi@...nel.org>, <kwilczynski@...nel.org>, <mani@...nel.org>,
        <robh@...nel.org>, <bhelgaas@...gle.com>, <jingoohan1@...il.com>,
        <quic_wenbyao@...cinc.com>, <inochiama@...il.com>,
        <mayank.rana@....qualcomm.com>, <thippeswamy.havalige@....com>,
        <shradha.t@...sung.com>, <cassel@...nel.org>, <kishon@...nel.org>,
        <sergio.paracuellos@...il.com>, <18255117159@....com>,
        <rongqianfeng@...o.com>, <jirislaby@...nel.org>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH v4 3/4] PCI: keystone: Exit ks_pcie_probe() for invalid mode

Commit under Fixes introduced support for PCIe EP mode on AM654x platforms.
When the mode happens to be either "DW_PCIE_RC_TYPE" or "DW_PCIE_EP_TYPE",
the PCIe Controller is configured accordingly. However, when the mode is
neither of them, an error message is displayed but the driver probe
succeeds. Since this "invalid" mode is not associated with a functional
PCIe Controller, the probe should fail.

Fix the behavior by exiting "ks_pcie_probe()" with the return value of
"-EINVAL" in addition to displaying the existing error message when the
mode is invalid.

Fixes: 23284ad677a9 ("PCI: keystone: Add support for PCIe EP in AM654x Platforms")
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---

NOTE: As stated in the v3 patch, although a Fixes tag has been added,
the patch doesn't have to be backported. Hence, 'stable' hasn't been
CCed on purpose.

v3:
https://lore.kernel.org/r/20250922071222.2814937-4-s-vadapalli@ti.com/
Changes since v3:
- Rebased patch on 6.18-rc1 tag of Mainline Linux.

Regards,
Siddharth.

 drivers/pci/controller/dwc/pci-keystone.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c
index eb00aa380722..25b8193ffbcf 100644
--- a/drivers/pci/controller/dwc/pci-keystone.c
+++ b/drivers/pci/controller/dwc/pci-keystone.c
@@ -1337,6 +1337,8 @@ static int ks_pcie_probe(struct platform_device *pdev)
 		break;
 	default:
 		dev_err(dev, "INVALID device type %d\n", mode);
+		ret = -EINVAL;
+		goto err_get_sync;
 	}

 	ks_pcie_enable_error_irq(ks_pcie);
-- 
2.51.0