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Wed, 4 Nov 2026 19:41:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821292; bh=QnuUeY+9+QMi3OegoRzUMDksdZE42uDQ+p1ThOeCsVw=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=a4qjG/Enl784wKvVxl/9ldVwuuHEc87Y0LUedobA/KdwuI3SCxAckwhwEAtDdOOqU UqZPPnd0i1wsEQPINzLmBf7fes9X1w97pMqml0mB5btMrfd8uToyQFpFM0Tl2wlAjD kgF4RA3JR3lH8viB9FAeGA4ZqAZXhhvVqKaCxsHsidrZt3ppkwceT62jwKoGEsMlOx 78OYFlBnZIcEweu6rx9OyaYzVUpLMbaYn5Kxkk/UsZEPHpo8JcSdi7maG+VD8tqYHf NonEOsq87sjklv+/uShbdJtRlOOZ5V+hHfFMq2FNCALvQq2gchvAnrCclCithYaHdM zs/aDQjJX2z7g== 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 23/23] PNP: isapnp: let procfs copy out reads Date: Wed, 4 Nov 2026 20:41:18 +0100 Message-ID: <20261104-work-procfs-arch-v2-23-2aeb952c9597@kernel.org> In-Reply-To: <20261104-work-procfs-arch-v2-0-2aeb952c9597@kernel.org> References: <20261104-work-procfs-arch-v2-0-2aeb952c9597@kernel.org> 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" X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1810; i=brauner@kernel.org; h=from:subject:message-id; bh=O9tLcZSRMcgAQbB8Pp6p1hVEIxcx9tANJYkp4CgYVW0=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97uRoSC+OPd30eNcyzvc/yy/YbGGdvPLwp7wL4ZnJy 2++kTT52VHKwiDGxSArpsji0G4SLrecp2KzUaYGzBxWJpAhDFycAjCRoLeMDKvtZufJ1LDZnWzr aM1t2LBM8N+nLa95p/c8m1iiUHw97gDDP8vnB0xly+JWrdKTyXnq2i/YvW3iPe61nAKrrcqOL/1 xhQUA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit 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 1829c20d5446..2634db5f41e2 100644 --- a/drivers/pnp/isapnp/proc.c +++ b/drivers/pnp/isapnp/proc.c @@ -19,40 +19,34 @@ 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; int ret; if (pos >= size) return 0; if (nbytes > size - pos) nbytes = size - pos; - cnt = nbytes; - - if (!access_ok(buf, cnt)) - return -EINVAL; ret = isapnp_cfg_begin(dev->card->number, dev->number); if (ret) return ret; - 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