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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=EaLRWWjc; 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 B2F0D60807B7; Wed, 4 Nov 2026 19:38:34 +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=EaLRWWjc Received: by smtp.kernel.org (Postfix) with ESMTPSA id 55DFA1F000C1; Wed, 4 Nov 2026 19:38:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821114; bh=XEKsvRvbQWppTyh1wQqi6XPYHGzRxd9NXleDa7PK/rs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=EaLRWWjcN4LLtMOZCh1DK40g1/b6+I6lfVBt9n9EF90MTHukgj10jc7nnxg9IofMR GsjkGzfQKuhKOZ+n3/LW++jhgPDusZmmjz6slzPCN4lXGLSEShUFZEJIC20Khv1Qea BGx6s9+LOr0H4FffGoKVCTJI6Ox55pPB2uJk3qh/GT5DTKhi1tn3D4FIlveOjDIU6b mKrYG8hw6tkNgyXfyvZin/Q7MUwaN2ZXQsXOtudCeeuRmmy8PaA7teUhlewcJMvgHe mVgidIbouLxKCLXkR7E6TgFrG6bkV22opE3xoLYbtq0zUE746RrGpkbGpCqYQxYjdM 22p7i8EAfY8SA== 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 11/23] sparc: led: let procfs copy in writes Date: Wed, 4 Nov 2026 20:38:20 +0100 Message-ID: <20261104-work-procfs-arch-v2-11-2aeb952c9597@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: linux-kernel@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" X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1493; i=brauner@kernel.org; h=from:subject:message-id; bh=AqaUJeRV3kbpXVh8nmhEIr+kHQG3PHbqm52TQh+zorQ=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97vjpvd0rM2/K/IZazunNazZslZwnnKe7oWiOz5a9r +eECD5T7yhlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZhIaCUjw8/DEZOOcC31OhN2 f1ax7FPvDa8lyu+sOCFkmxv8bxebMA8jw8uyVjH2g1fyQq9GrFjLuy9g09x/Z3+8EmheILZS646 OBgMA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit Implement ->proc_write_buf() so procfs copies in what is written to /proc/led before it pins the entry, and parse the command from that copy. Writes larger than PAGE_SIZE - 1 bytes fail with -EINVAL now. Signed-off-by: Christian Brauner (Amutable) --- arch/sparc/kernel/led.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/arch/sparc/kernel/led.c b/arch/sparc/kernel/led.c index 0f7376b51a04..1f244e394207 100644 --- a/arch/sparc/kernel/led.c +++ b/arch/sparc/kernel/led.c @@ -60,18 +60,14 @@ static int led_proc_show(struct seq_file *m, void *v) return 0; } -static ssize_t led_proc_write(struct file *file, const char __user *buffer, +static ssize_t led_proc_write(struct file *file, char *buf, size_t count, loff_t *ppos) { size_t len = count; - char *buf = NULL; if (count > LED_MAX_LENGTH) count = LED_MAX_LENGTH; - - buf = memdup_user_nul(buffer, count); - if (IS_ERR(buf)) - return PTR_ERR(buf); + buf[count] = '\0'; /* work around \n when echo'ing into proc */ if (count > 0 && buf[count - 1] == '\n') @@ -96,14 +92,12 @@ static ssize_t led_proc_write(struct file *file, const char __user *buffer, auxio_set_led(AUXIO_LED_OFF); } - kfree(buf); - return len; } static const struct proc_ops led_proc_ops = { .proc_show = led_proc_show, - .proc_write = led_proc_write, + .proc_write_buf = led_proc_write, }; #endif -- 2.53.0