From patchwork Mon Mar 6 15:59:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 13161504 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F1B2FC77B6F for ; Mon, 6 Mar 2023 16:01:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231454AbjCFQA7 (ORCPT ); Mon, 6 Mar 2023 11:00:59 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41468 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230036AbjCFQAh (ORCPT ); Mon, 6 Mar 2023 11:00:37 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D40E92E0D3; Mon, 6 Mar 2023 08:00:36 -0800 (PST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 8A86A1FE0E; Mon, 6 Mar 2023 16:00:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118435; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cbqgFJuuPg76i7Tnxrt6nBFhBok7n+TE7fgC7SU4OZ0=; b=Da0ENzwyFBTDsMLo3AswyCJ9nQ9MmJnvXIiRNIlgJMp8QxpKUpzomHhERtz7loGmLfN9/p nF6oWsvZzIka7u2mWeUEC8hxpWZrWylGj5N2SlgXnao2CDocmqTHpMBB59YQh5B76luBMI cE9fKUckWZT87SJ2zppW3J4HWEH8f04= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118435; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cbqgFJuuPg76i7Tnxrt6nBFhBok7n+TE7fgC7SU4OZ0=; b=YH3fqQmGKJmw+1YRRJcCgP64iONty98Zbul4QvaYMSkTYTluCtSrVH4Kb5bWog113QORMV IJ9+FtaoXxj4QoDA== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 2D16013513; Mon, 6 Mar 2023 16:00:35 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id wO0pCiMOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:35 +0000 From: Thomas Zimmermann To: deller@gmx.de, paulus@samba.org, benh@kernel.crashing.org, linux@armlinux.org.uk, pjones@redhat.com, timur@kernel.org, adaplas@gmail.com, s.hauer@pengutronix.de, shawnguo@kernel.org, mbroemme@libmpq.org, thomas@winischhofer.net, James.Bottomley@HansenPartnership.com, spock@gentoo.org, sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com, geert+renesas@glider.be, corbet@lwn.net Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 30/99] fbdev/gxt4500: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:59:07 +0100 Message-Id: <20230306160016.4459-31-tzimmermann@suse.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230306160016.4459-1-tzimmermann@suse.de> References: <20230306160016.4459-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Assume that the driver does not own the option string or its substrings and hence duplicate the option string for the video mode. The driver only parses the option string once as part of module initialization, so use a static buffer to store the duplicated mode option. Linux automatically frees the memory upon releasing the module. Done in preparation of constifying the option string. Signed-off-by: Thomas Zimmermann --- drivers/video/fbdev/gxt4500.c | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/video/fbdev/gxt4500.c b/drivers/video/fbdev/gxt4500.c index 5f42d3d9d6ce..61bc714693f5 100644 --- a/drivers/video/fbdev/gxt4500.c +++ b/drivers/video/fbdev/gxt4500.c @@ -779,12 +779,28 @@ static struct pci_driver gxt4500_driver = { static int gxt4500_init(void) { +#ifndef MODULE + char *options; +#endif + if (fb_modesetting_disabled("gxt4500")) return -ENODEV; #ifndef MODULE - if (fb_get_options("gxt4500", &mode_option)) + if (fb_get_options("gxt4500", &options)) return -ENODEV; + + do { + static char mode_option_buf[256]; + int ret; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", options); + if (WARN(ret < 0, "gxt4500: ignoring invalid option, ret=%d\n", ret)) + break; + if (WARN(ret >= sizeof(mode_option_buf), "gxt4500: option too long\n")) + break; + mode_option = mode_option_buf; + } while (0); #endif return pci_register_driver(&gxt4500_driver);