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GET /api/patches/2196249/?format=api
{ "id": 2196249, "url": "http://patchwork.ozlabs.org/api/patches/2196249/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260213092958.864411-6-tzungbi@kernel.org/", "project": { "id": 42, "url": "http://patchwork.ozlabs.org/api/projects/42/?format=api", "name": "Linux GPIO development", "link_name": "linux-gpio", "list_id": "linux-gpio.vger.kernel.org", "list_email": "linux-gpio@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260213092958.864411-6-tzungbi@kernel.org>", "list_archive_url": null, "date": "2026-02-13T09:29:52", "name": "[v3,05/11] gpio: cdev: Don't check struct gpio_chip in gpio_chrdev_open()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "f5217efbc6d9b178cefa528bc89f7ce59aca6cad", "submitter": { "id": 83557, "url": "http://patchwork.ozlabs.org/api/people/83557/?format=api", "name": "Tzung-Bi Shih", "email": "tzungbi@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-gpio/patch/20260213092958.864411-6-tzungbi@kernel.org/mbox/", "series": [ { "id": 492068, "url": "http://patchwork.ozlabs.org/api/series/492068/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-gpio/list/?series=492068", "date": "2026-02-13T09:29:47", "name": "gpio: Adopt revocable mechanism for UAF prevention", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/492068/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196249/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196249/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-gpio+bounces-31662-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-gpio@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=TWrwKmsz;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; helo=sea.lore.kernel.org;\n envelope-from=linux-gpio+bounces-31662-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"TWrwKmsz\"", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201" ], "Received": [ "from sea.lore.kernel.org (sea.lore.kernel.org [172.234.253.10])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fC6Rj5dcFz1xvQ\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 13 Feb 2026 20:33:37 +1100 (AEDT)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id F1B223142BAA\n\tfor <incoming@patchwork.ozlabs.org>; Fri, 13 Feb 2026 09:31:18 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id AAD03330D2F;\n\tFri, 13 Feb 2026 09:31:18 +0000 (UTC)", "from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A83C31A044;\n\tFri, 13 Feb 2026 09:31:17 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id F1429C19421;\n\tFri, 13 Feb 2026 09:31:14 +0000 (UTC)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1770975078; cv=none;\n b=ncsT83phnt/Sn/al26fWXx3AdfO1A1SOXAlpCctJaBJE6mm+8bqUlY67IRoQh4PDQsvdypb+Asm0RCOhMBtOQZWT1b5jyiobbtwN8Nm2MKj5XR/DNE6ufJOQJV1TBnZkCrc/poVEMUPBpAWnLHnlKkK5ce4wSK0l6dECV8pDcpI=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1770975078; c=relaxed/simple;\n\tbh=MhNx3S0dVlpNxKMRcdobUk3hHUbH0H41bs4+2RGrNYw=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=cOkkvWDs4B7sPL+nMTE0SnpTfPto9x2cSiqQHvds1jpe43/YL8jMdIZoMtpjZ4GJFKBVFZjosZG1iH4jjNKB3Uj6RizRIEEgpLk4emGn3gGSSLhXtpP+Z9k5Txe+69pdZjiLFxbx8YWwkkaZJdnSuyzsCAEk5gVmLaMmmPRUzSA=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=TWrwKmsz; arc=none smtp.client-ip=10.30.226.201", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1770975077;\n\tbh=MhNx3S0dVlpNxKMRcdobUk3hHUbH0H41bs4+2RGrNYw=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=TWrwKmszBLe/Bar8C4Mt8P2JxMjERmVpyNENpy0vWefh6rLl8F/jQzCpGL/f2ff+1\n\t IbgTE7zn12xKEzb6j/gNFYRnlsVPzfuKRlhSHtgXGkOZ02XuW1TNrn7aeZw2NwdA8k\n\t 3DtJC+aJQZe3xc+Eh0f+J0N7GwDAyS8C6e0j/xg66UmERfCvRKhV+uMVRGT/XSpVKP\n\t 2SwvsbIgc6Uhp4+dg9O/RiNFUFQch2BK2FAPYxJjW8ysRtewLdUrZ+3ZoOGLOmhXmD\n\t d6MFxCEk+2pBeCVkn8/54jXpPxPjQYv7AfVD0kfFwEp6ZdvpQ9Q6zPfxUQCA4VhHyo\n\t MFsXxqxjGpH1g==", "From": "Tzung-Bi Shih <tzungbi@kernel.org>", "To": "Bartosz Golaszewski <brgl@kernel.org>,\n\tLinus Walleij <linusw@kernel.org>", "Cc": "Greg Kroah-Hartman <gregkh@linuxfoundation.org>,\n\t\"Rafael J. Wysocki\" <rafael@kernel.org>,\n\tDanilo Krummrich <dakr@kernel.org>,\n\tJonathan Corbet <corbet@lwn.net>,\n\tShuah Khan <shuah@kernel.org>,\n\tLaurent Pinchart <laurent.pinchart@ideasonboard.com>,\n\tWolfram Sang <wsa+renesas@sang-engineering.com>,\n\tJason Gunthorpe <jgg@nvidia.com>,\n\tJohan Hovold <johan@kernel.org>,\n\t\"Paul E . McKenney\" <paulmck@kernel.org>,\n\tDan Williams <dan.j.williams@intel.com>,\n\tchrome-platform@lists.linux.dev,\n\ttzungbi@kernel.org,\n\tlinux-gpio@vger.kernel.org,\n\tlinux-kselftest@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org", "Subject": "[PATCH v3 05/11] gpio: cdev: Don't check struct gpio_chip in\n gpio_chrdev_open()", "Date": "Fri, 13 Feb 2026 09:29:52 +0000", "Message-ID": "<20260213092958.864411-6-tzungbi@kernel.org>", "X-Mailer": "git-send-email 2.53.0.310.g728cabbaf7-goog", "In-Reply-To": "<20260213092958.864411-1-tzungbi@kernel.org>", "References": "<20260213092958.864411-1-tzungbi@kernel.org>", "Precedence": "bulk", "X-Mailing-List": "linux-gpio@vger.kernel.org", "List-Id": "<linux-gpio.vger.kernel.org>", "List-Subscribe": "<mailto:linux-gpio+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-gpio+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "It's harmless even if: chrdev_open() and cdev_device_del() run at the\nsame time, and gpio_chrdev_open() gets called after the underlying GPIO\nchip has gone. The subsequent file operations check the availability\nof struct gpio_chip anyway.\n\nDon't check struct gpio_chip in gpio_chrdev_open().\n\nSigned-off-by: Tzung-Bi Shih <tzungbi@kernel.org>\n---\nv3:\n- No changes.\n\nv2: https://lore.kernel.org/all/20260203061059.975605-6-tzungbi@kernel.org\n- No changes.\n\nv1: https://lore.kernel.org/all/20260116081036.352286-11-tzungbi@kernel.org\n\n drivers/gpio/gpiolib-cdev.c | 6 ------\n 1 file changed, 6 deletions(-)", "diff": "diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c\nindex b028198adba8..2e3484a89a3b 100644\n--- a/drivers/gpio/gpiolib-cdev.c\n+++ b/drivers/gpio/gpiolib-cdev.c\n@@ -2689,12 +2689,6 @@ static int gpio_chrdev_open(struct inode *inode, struct file *file)\n \tstruct gpio_chardev_data *cdev;\n \tint ret = -ENOMEM;\n \n-\tguard(srcu)(&gdev->srcu);\n-\n-\t/* Fail on open if the backing gpiochip is gone */\n-\tif (!rcu_access_pointer(gdev->chip))\n-\t\treturn -ENODEV;\n-\n \tcdev = kzalloc(sizeof(*cdev), GFP_KERNEL);\n \tif (!cdev)\n \t\treturn -ENOMEM;\n", "prefixes": [ "v3", "05/11" ] }