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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=JEtEk3Xg; 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 77E8C608C973; Mon, 2 Nov 2026 15:10:57 +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=JEtEk3Xg Received: by smtp.kernel.org (Postfix) with ESMTPSA id AAFB91F00A18; Mon, 2 Nov 2026 15:10:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793632257; bh=gEfU3T2fMjgdZUubap6/Nt8I8xKTHWl/++QTJaSUEcE=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=JEtEk3XgkB7h/KCKSpjSx/GQWpU/P/7tvtCdnnzCxrDpIn594psdLHFTrmfuke6dM slBqHYXHnT54x/QPrsmxH3yeqxfZQPD2y0pgY1+PEiyIIJsHQEmrStcSZUBzYnriXr z1cAZ9kaI1mij4Fc3B7DH9EC4k1fIQp6BDZOK3UL5awrKforvD4qmdeHd8pveKvbcx iZMvCpnYB/tvXMP/UoxQpEd6uLwjQn9oT2yIsRi+8s3j66mGWx98OAk1gVJO1c+yd/ xAonphmuY1qwZTlY+D0zGjvzNIJDEogTrjTuIG2qL99CLq6eIn2OG7zpSiKwd/V4oF 8+lGx05vpGPgQ== From: Christian Brauner Date: Mon, 02 Nov 2026 16:07:09 +0100 Subject: [PATCH RFC 02/23] zorro: let procfs copy out reads X-Mailing-List: linux-alpha@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-drivers-v1-2-a994bd4d3b1a@kernel.org> References: <20261102-work-procfs-drivers-v1-0-a994bd4d3b1a@kernel.org> In-Reply-To: <20261102-work-procfs-drivers-v1-0-a994bd4d3b1a@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=1540; i=brauner@kernel.org; h=from:subject:message-id; bh=0V4WXwhQL5pRZKlAhpvNvMMTbS/E9DKCsIQEEH9Ob/I=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9WG7AIbrx5h2jApOfJWsWGW9hzDP7Z1n71GbDkhKjd 1G75+1S7ShlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZjI/UaG36wcDIusu3nPOnFM /P+8oNKCR/ZZrpFyDV/sHU9NRa7UTIb/YfZNrhe7BR60inb8XH12tpIKe1zQvdmbziyrv3LhEYc VLwA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Implement ->proc_read_buf() so procfs copies what is read from /proc/bus/zorro/ to userspace after it unpinned the entry. Signed-off-by: Christian Brauner (Amutable) --- drivers/zorro/proc.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/zorro/proc.c b/drivers/zorro/proc.c index f916bf60b312..4e4ba04752ea 100644 --- a/drivers/zorro/proc.c +++ b/drivers/zorro/proc.c @@ -28,7 +28,7 @@ proc_bus_zorro_lseek(struct file *file, loff_t off, int whence) } static ssize_t -proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos) +proc_bus_zorro_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos) { struct zorro_dev *z = pde_data(file_inode(file)); struct ConfigDev cd; @@ -49,8 +49,7 @@ proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t * cd.cd_BoardAddr = cpu_to_be32(zorro_resource_start(z)); cd.cd_BoardSize = cpu_to_be32(zorro_resource_len(z)); - if (copy_to_user(buf, (void *)&cd + pos, nbytes)) - return -EFAULT; + memcpy(buf, (void *)&cd + pos, nbytes); *ppos += nbytes; return nbytes; @@ -58,7 +57,7 @@ proc_bus_zorro_read(struct file *file, char __user *buf, size_t nbytes, loff_t * static const struct proc_ops bus_zorro_proc_ops = { .proc_lseek = proc_bus_zorro_lseek, - .proc_read = proc_bus_zorro_read, + .proc_read_buf = proc_bus_zorro_read, }; static void * zorro_seq_start(struct seq_file *m, loff_t *pos) -- 2.53.0