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GET /api/patches/2194476/?format=api
{ "id": 2194476, "url": "http://patchwork.ozlabs.org/api/patches/2194476/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260209062952.2049053-8-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, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260209062952.2049053-8-den@valinux.co.jp>", "list_archive_url": null, "date": "2026-02-09T06:29:50", "name": "[v5,7/8] 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/20260209062952.2049053-8-den@valinux.co.jp/mbox/", "series": [ { "id": 491464, "url": "http://patchwork.ozlabs.org/api/series/491464/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=491464", "date": "2026-02-09T06:29:44", "name": "PCI: endpoint: pci-ep-msi: Add embedded doorbell fallback", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/491464/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2194476/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2194476/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-46980-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ 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dkim=pass header.d=valinux.co.jp; arc=none" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=valinux.co.jp;\n s=selector1;\n h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck;\n bh=LmZ6hbpugReJK6Dpis4ijSWWldbK6J+3kcRgGdadZm4=;\n b=RodQcXefXTfcHJ4yClA5K3PoYYq4Zpd/UFf8lhUNcpawr/xgC5TfkHpXZK+swGM3Ov4VYaKtJqswIUDUDMu+tbSDal3C6K43igKR9WRkceADgmnxJqSKtXBqwqi/Mno6r0OfxAiuU1N2anvEjZXuKx2nHz4AYP+e2sHxkKUiDgI=", "From": "Koichiro Den <den@valinux.co.jp>", "To": "vkoul@kernel.org,\n\tmani@kernel.org,\n\tFrank.Li@nxp.com,\n\tcassel@kernel.org,\n\tjingoohan1@gmail.com,\n\tlpieralisi@kernel.org,\n\tkwilczynski@kernel.org,\n\trobh@kernel.org,\n\tbhelgaas@google.com,\n\tkishon@kernel.org,\n\tjdmason@kudzu.us,\n\tallenbh@gmail.com", "Cc": "dmaengine@vger.kernel.org,\n\tlinux-pci@vger.kernel.org,\n\tntb@lists.linux.dev,\n\tlinux-kselftest@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Subject": "[PATCH v5 7/8] PCI: endpoint: pci-ep-msi: Fix error unwind and\n prevent double alloc", "Date": "Mon, 9 Feb 2026 15:29:50 +0900", "Message-ID": "<20260209062952.2049053-8-den@valinux.co.jp>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260209062952.2049053-1-den@valinux.co.jp>", "References": "<20260209062952.2049053-1-den@valinux.co.jp>", "Content-Transfer-Encoding": "8bit", "Content-Type": "text/plain", "X-ClientProxiedBy": "TYCP286CA0068.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:400:31a::8) To TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM\n (2603:1096:405:38f::10)", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "X-MS-PublicTrafficType": "Email", "X-MS-TrafficTypeDiagnostic": "TY7P286MB7722:EE_|TYYP286MB4425:EE_", "X-MS-Office365-Filtering-Correlation-Id": "53426b62-437a-4b54-b5c5-08de67a4a983", 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"X-OriginatorOrg": "valinux.co.jp", "X-MS-Exchange-CrossTenant-Network-Message-Id": "\n 53426b62-437a-4b54-b5c5-08de67a4a983", "X-MS-Exchange-CrossTenant-AuthSource": "TY7P286MB7722.JPNP286.PROD.OUTLOOK.COM", "X-MS-Exchange-CrossTenant-AuthAs": "Internal", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "09 Feb 2026 06:30:04.9960\n (UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "7a57bee8-f73d-4c5f-a4f7-d72c91c8c111", "X-MS-Exchange-CrossTenant-MailboxType": "HOSTED", "X-MS-Exchange-CrossTenant-UserPrincipalName": "\n zqkYSh8L8F2caKiknm0ce4SkWJaaF1sIdql8yIhLX7y3wD/LLdmY9WRwPuQJH/7xrzpJuvKaySz9erzt2tbf0A==", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "TYYP286MB4425" }, "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\")\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": [ "v5", "7/8" ] }