From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 A08B6608B7F9 for ; Mon, 2 Nov 2026 15:09:05 +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: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4jJFTr2mW5z3cFG; Tue, 03 Nov 2026 02:09:04 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.234.252.31 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1793632144; cv=none; b=UxakCOJrj2htVHFZYt1m59JQ6WVFEAjw3ioWmevlfZ901aaVULK1DLIIEjIpI1QTyuzk5PN4zeOTQxnAMYe4kooPYI51f5/3NttjM/Xu23Gn51x5QME2L+m7RWrURK1f5ZfA2toydvNpbes8rhMnTJmFTEOlYi8LZCF1gj2IrYZ3zPxfb72hN8AIV4edoRQqundCfxSYFOH4Knku4BHcA+QFOFPBlssOurC2RSNMaPV4WysI5Fo+MiPAbsmku1338kaVa6FBbYsusiGgQY5KAM8wADnyUn24vkNPMLMu86dfVcF5qvBj5XTQ4HoK8B8BV7Kc/UiFJfhuBv15QaPibw== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1793632144; c=relaxed/relaxed; bh=YGofg29spfHBU5j0sEupYlWEu86pUC9IfXeVVL8qINU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=NkNC1CYYG6idLrhb8BDi7YeEWtFFX1il3vRMfaSZuQfuYXeM4/sGFV32DHY7WGQV2UZ3qvw8Ai97z3ZyRNNa+++fUjXhZgppo9N6iorLYYzsdKCs0EVegmjw8cBWyTHIa68xrQqQM6s/xbeObKxfj8wHftzS2KZCnGWnVWli5U2e/QBQoIdgcNtb/ztBfsnOwzzn9gymxqLAe6UiJ6y1d+oAEw4brGhNWXWMJpoS7qV1d8dU/RvVG+yv+j5AeL7hosc7ASz5IvDP41RQXDG5+m7zLxV0UnS1Pv0wF9u/jK16KM/USdpXzji1FXEP0brTCMyEp7P+6e9WotV7gKw3pg== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=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; dkim-atps=neutral; spf=pass (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=brauner@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.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; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=brauner@kernel.org; receiver=lists.ozlabs.org) Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4jJFTq4Ykcz3bYG for ; Tue, 03 Nov 2026 02:09:03 +1100 (AEDT) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 056B14197D; Mon, 2 Nov 2026 15:09:02 +0000 (UTC) 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: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: 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 X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, 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/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