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{
    "id": 2196624,
    "url": "http://patchwork.ozlabs.org/api/patches/2196624/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260215150914.3392479-5-den@valinux.co.jp/",
    "project": {
        "id": 28,
        "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api",
        "name": "Linux PCI development",
        "link_name": "linux-pci",
        "list_id": "linux-pci.vger.kernel.org",
        "list_email": "linux-pci@vger.kernel.org",
        "web_url": null,
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        "webscm_url": null,
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        "commit_url_format": ""
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    "msgid": "<20260215150914.3392479-5-den@valinux.co.jp>",
    "list_archive_url": null,
    "date": "2026-02-15T15:09:14",
    "name": "[4/4] PCI: endpoint: pci-ep-msi: Fix error unwind and prevent double alloc",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "ed2e6142329df71269fd0cf8e0def145d970d3b4",
    "submitter": {
        "id": 91573,
        "url": "http://patchwork.ozlabs.org/api/people/91573/?format=api",
        "name": "Koichiro Den",
        "email": "den@valinux.co.jp"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260215150914.3392479-5-den@valinux.co.jp/mbox/",
    "series": [
        {
            "id": 492223,
            "url": "http://patchwork.ozlabs.org/api/series/492223/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=492223",
            "date": "2026-02-15T15:09:10",
            "name": "PCI: endpoint: Doorbell-related fixes",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/492223/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/2196624/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/2196624/checks/",
    "tags": {},
    "related": [],
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        "From": "Koichiro Den <den@valinux.co.jp>",
        "To": "mani@kernel.org,\n\tkwilczynski@kernel.org,\n\tkishon@kernel.org,\n\tbhelgaas@google.com,\n\tjdmason@kudzu.us,\n\tdave.jiang@intel.com,\n\tallenbh@gmail.com,\n\tcassel@kernel.org,\n\tFrank.Li@nxp.com",
        "Cc": "linux-pci@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tntb@lists.linux.dev",
        "Subject": "[PATCH 4/4] PCI: endpoint: pci-ep-msi: Fix error unwind and prevent\n double alloc",
        "Date": "Mon, 16 Feb 2026 00:09:14 +0900",
        "Message-ID": "<20260215150914.3392479-5-den@valinux.co.jp>",
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    },
    "content": "pci_epf_alloc_doorbell() stores the allocated doorbell message array in\nepf->db_msg/epf->num_db before requesting MSI vectors. If MSI allocation\nfails, the array is freed but the EPF state may still point to freed\nmemory.\n\nClear epf->db_msg and epf->num_db on the MSI allocation failure path so\nthat later cleanup cannot double-free the array and callers can retry\nallocation.\n\nAlso return -EBUSY when doorbells have already been allocated to prevent\nleaking or overwriting an existing allocation.\n\nFixes: 1c3b002c6bf6 (\"PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller\")\nReviewed-by: Frank Li <Frank.Li@nxp.com>\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\n drivers/pci/endpoint/pci-ep-msi.c | 5 +++++\n 1 file changed, 5 insertions(+)",
    "diff": "diff --git a/drivers/pci/endpoint/pci-ep-msi.c b/drivers/pci/endpoint/pci-ep-msi.c\nindex 1b58357b905f..ad8a81d6ad77 100644\n--- a/drivers/pci/endpoint/pci-ep-msi.c\n+++ b/drivers/pci/endpoint/pci-ep-msi.c\n@@ -50,6 +50,9 @@ int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db)\n \t\treturn -EINVAL;\n \t}\n \n+\tif (epf->db_msg)\n+\t\treturn -EBUSY;\n+\n \tdomain = of_msi_map_get_device_domain(epc->dev.parent, 0,\n \t\t\t\t\t      DOMAIN_BUS_PLATFORM_MSI);\n \tif (!domain) {\n@@ -79,6 +82,8 @@ int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db)\n \tif (ret) {\n \t\tdev_err(dev, \"Failed to allocate MSI\\n\");\n \t\tkfree(msg);\n+\t\tepf->db_msg = NULL;\n+\t\tepf->num_db = 0;\n \t\treturn ret;\n \t}\n \n",
    "prefixes": [
        "4/4"
    ]
}