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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=ScTRyul4; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D6746606ABB3; Mon, 2 Nov 2026 15:31:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=ScTRyul4 Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6FC01F00A16; Mon, 2 Nov 2026 15:30:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793633463; bh=8JYviDqoWsEGN3uNb5Mh66eaw6snQ2TUUnHcmJoMJ80=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=ScTRyul4UqS1mWJvOzmwvwPQ//Itx9TsdsxsJwGYb3Gmm/J0WkPfUMLBfXwRwQRsr Nim+Y+d24g3hKICsmz4+hJ76wRo71Zgu8JYSNQex1bY6jYxc4yR4NIKTkU/b0bzekF oTZ8Mqaf/qJiOTrQ3fVHdV5XUUZFZ9Rv79SVAaVRi4pTwuCDqET0rxCczTm7RhsOI9 GL2XYnYI3rKEga2Ls6G2iIhPzet32Cl17pJvVFcx5D8ihh7MkSTm+FLpZqjgFDVWCL 7PucMdluq4M256zUScAZVO6B7k8GrovbDY4lddqqcnnXFtmxqpelNIoflJ7mv/9GqF EQVHm3m/21Cfg== From: Christian Brauner Date: Mon, 02 Nov 2026 16:07:15 +0100 Subject: [PATCH RFC 01/11] atm: let procfs copy out reads of the device files X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-net-v1-1-982104a4f592@kernel.org> References: <20261102-work-procfs-net-v1-0-982104a4f592@kernel.org> In-Reply-To: <20261102-work-procfs-net-v1-0-982104a4f592@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1517; i=brauner@kernel.org; h=from:subject:message-id; bh=gPjf1XFsI8l/uiq7gtBYaOS5PIZm1WCyT/xvmcgXYrk=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9WG78cE1u8seuk/K3unk+6P7jWeW5b87CvLufg14ar jS+H74/oKOUhUGMi0FWTJHFod0kXG45T8Vmo0wNmDmsTCBDGLg4BWAis2UYGeay2p/6sZbx0Dzp lNKfYqc/nLPyU7XaNW1f+AvTfu35FjsYGdonXm11v5fkNuWfeN7rc08f7rarf8sV6GTp9Xk23+y Xx3kB X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Implement ->proc_read_buf() so procfs copies what is read from /proc/net/atm/ to userspace after it unpinned the entry. The drivers' ->proc_read() keep filling their page. Signed-off-by: Christian Brauner (Amutable) --- net/atm/proc.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) diff --git a/net/atm/proc.c b/net/atm/proc.c index ca0fc6b90998..cea930b4b840 100644 --- a/net/atm/proc.c +++ b/net/atm/proc.c @@ -30,11 +30,11 @@ #include "resources.h" #include "common.h" /* atm_proc_init prototype */ -static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, +static ssize_t proc_dev_atm_read(struct file *file, char *buf, size_t count, loff_t *pos); static const struct proc_ops atm_dev_proc_ops = { - .proc_read = proc_dev_atm_read, + .proc_read_buf = proc_dev_atm_read, .proc_lseek = noop_llseek, }; @@ -246,7 +246,7 @@ static const struct seq_operations vcc_seq_ops = { .show = vcc_seq_show, }; -static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, +static ssize_t proc_dev_atm_read(struct file *file, char *buf, size_t count, loff_t *pos) { struct atm_dev *dev; @@ -267,8 +267,7 @@ static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, length = -EINVAL; } if (length >= 0) { - if (copy_to_user(buf, (char *)page, length)) - length = -EFAULT; + memcpy(buf, (char *)page, length); (*pos)++; } free_page(page); -- 2.53.0