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Wed, 4 Nov 2026 19:57:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793822288; bh=8JYviDqoWsEGN3uNb5Mh66eaw6snQ2TUUnHcmJoMJ80=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=omYmnILU6n/a/8ypDuatFcm5Yn1YdJM3CRKKuli7fcBySnvTgN50xiis4mVllM49v PV+Quk0y9VPAUT7onGY2p/nLF2xkGIDIWXqi4tkrhVP7JJganO4BAn8bDHMRztyoBl kDuAQDvNJ8Uuc3JHKiaYHNXgDWLaFbsRCKaJ0zpPBvI9qjf+zzVVphC8QUnWa1gAS9 TqNqVumOE5u8pqbbZNrZhXFAdBkCmBN9rMMWYN4XW4rPv+P/EOoobKcvq4QxkXRKVJ s5UQbq8xS22dtefS2Q7ckkJlMa6rIUtShtzwuWqlg+ImTJMyCWJ++E2LN9ezNnICps 7WSbKOm7NJ/JQ== From: Christian Brauner 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 Subject: [PATCH RESEND v2 01/13] atm: let procfs copy out reads of the device files Date: Wed, 4 Nov 2026 20:57:54 +0100 Message-ID: <20261104-work-procfs-net-v2-1-221e2437fed1@kernel.org> In-Reply-To: <20261104-work-procfs-net-v2-0-221e2437fed1@kernel.org> References: <20261104-work-procfs-net-v2-0-221e2437fed1@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" 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=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97lO2Xbpnsl62nNauWplf/xdYPBNLEnswIafyCd/XX xHhEwqnd5SyMIhxMciKKbI4tJuEyy3nqdhslKkBM4eVCWQIAxenAEwkTZuR4eHSqRGfps/7dvOV 691dX8+Wbls1oSJgtmlB5Vsb0VvvEssY/hllnXhlJifSrl2270GVY8Ldju5SgRBVQfPATZXl+2b r8AIA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" X-Spam-Status: No, score=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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