From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793632142; b=zyrWWTp/CjTMMI5y2omeY5l5xH2JpGK9OFB6Z+k0ECW2Y2lSsmq7ViqlYKi5rapa+gAN T+9Nc/ik8GLnYsg8n2BXFfp04wIjGVVJWR2zYGqNRhz2RyMHR4om0jRXDLhvE4E7XPEFv A7+uDEG9jHgDv95YzFjrdelFvTrkoxl2OkZINgxoBf04hbtzyNTU4Y3Q2pFS9YycJRjJs Uqn+Qmw+EWDOvoQ0f9fjo7bUWRmwM9fMXqLBMnuBsymEaXH9SCuVNT+2WTTpFBTq/k6pV zKDj++yBSh2WZt8HDEXBsB7zCl1xrR/CIaFvtr/o+CwPOXQ+GxtE9Yr21n9xtd1vBGQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793632142; h=Received:DKIM-Signature:From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:References:In-Reply-To:To:Cc: X-Mailer; bh=YGofg29spfHBU5j0sEupYlWEu86pUC9IfXeVVL8qINU=; b=twVgazNZF6trvunndkBAVwho0erdNOWjjpp7r+vSLga6Z02R5BY5dv2Al4ch1VB9SPXn vKdvGQkcXQWOdl7x6X/FIq6GT4YhXGc/NpqvO7R/EdPlvIGHSYdOHJOA5i5a5xqffV5NV Dh2Q5oFjeGpUfeD7VGII3ZgsaKDNHHnuigCELlUDzxmCFfiAUm7F+h0LVbV6wllTiuOjk NKAyBWfWINq5sJ9K5Rfgun3Wex92IQoYSkYBASkbSGMk6m03adF32qkyV+PCfUu1DGiWJ D/armF62UdUu+PVqcIg+U0YlJ7N5QeYeQCGtK4JrM5WACAqHG3PPtSmX20IDZL7b8RQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=JpmBPtZO; 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 0BA64606BA77; Mon, 2 Nov 2026 15:09:02 +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=JpmBPtZO Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5BB991F00A18; Mon, 2 Nov 2026 15:08:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793632141; bh=YGofg29spfHBU5j0sEupYlWEu86pUC9IfXeVVL8qINU=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=JpmBPtZO6G/UqVUziPY4iWq6sxFWqxjtkt4mByDfSmQn4JPupogU0bEEb3whcdZpv bxJjhl9riucbcDZJP757/It4YGJC5UnRtX978pao8OmQBnQl2aSFvJGabRNROHyvpQ bZzdyysVF3U57cA3Ja1OK9TBd8Tsli7X4hjtxAFP6BIZk3DMCdCyX58cnbypS2jX2/ rkwz1SxlnDr9giKtJvEtvZB1xm8ozK/+QHDHx5w/XweZen0aQhQjbqjSvObAObvY2I HxCcEBImWMheaGFA39+r4mxQ3C4umA03aHVfQBgmMCsinQB7bWR44TPgh7+0yTz50I jxnkq4gmT3FLQ== From: Christian Brauner Date: Mon, 02 Nov 2026 16:01:49 +0100 Subject: [PATCH RFC 22/22] PNP: isapnp: let procfs copy out reads X-Mailing-List: linux-input@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-arch-v1-22-c9492ab08480@kernel.org> References: <20261102-work-procfs-arch-v1-0-c9492ab08480@kernel.org> In-Reply-To: <20261102-work-procfs-arch-v1-0-c9492ab08480@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 Implement ->proc_read_buf() so procfs copies what is read from /proc/bus/isapnp// to userspace after it unpinned the entry. Signed-off-by: Christian Brauner (Amutable) --- drivers/pnp/isapnp/proc.c | 20 +++++++------------- 1 file changed, 7 insertions(+), 13 deletions(-) diff --git a/drivers/pnp/isapnp/proc.c b/drivers/pnp/isapnp/proc.c index 8197c7f29743..152fd5bfbc06 100644 --- a/drivers/pnp/isapnp/proc.c +++ b/drivers/pnp/isapnp/proc.c @@ -19,37 +19,31 @@ static loff_t isapnp_proc_bus_lseek(struct file *file, loff_t off, int whence) return fixed_size_llseek(file, off, whence, 256); } -static ssize_t isapnp_proc_bus_read(struct file *file, char __user * buf, +static ssize_t isapnp_proc_bus_read(struct file *file, char *buf, size_t nbytes, loff_t * ppos) { struct pnp_dev *dev = pde_data(file_inode(file)); loff_t pos = *ppos; - int cnt, size = 256; + int size = 256; + size_t cnt; if (pos >= size) return 0; if (nbytes > size - pos) nbytes = size - pos; - cnt = nbytes; - - if (!access_ok(buf, cnt)) - return -EINVAL; isapnp_cfg_begin(dev->card->number, dev->number); - for (; pos < 256 && cnt > 0; pos++, buf++, cnt--) { - unsigned char val; - val = isapnp_read_byte(pos); - put_user(val, buf); - } + for (cnt = 0; cnt < nbytes; cnt++) + buf[cnt] = isapnp_read_byte(pos + cnt); isapnp_cfg_end(); - *ppos = pos; + *ppos = pos + nbytes; return nbytes; } static const struct proc_ops isapnp_proc_bus_proc_ops = { .proc_lseek = isapnp_proc_bus_lseek, - .proc_read = isapnp_proc_bus_read, + .proc_read_buf = isapnp_proc_bus_read, }; static int isapnp_proc_attach_device(struct pnp_dev *dev) -- 2.53.0