From patchwork Mon Mar 6 16:00:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 659515 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 BE2FDC761A6 for ; Mon, 6 Mar 2023 16:02:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229509AbjCFQC0 (ORCPT ); Mon, 6 Mar 2023 11:02:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230115AbjCFQBL (ORCPT ); Mon, 6 Mar 2023 11:01:11 -0500 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E14242410D; Mon, 6 Mar 2023 08:01:03 -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-out1.suse.de (Postfix) with ESMTPS id 8513B22464; Mon, 6 Mar 2023 16:01:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118462; 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=9yTAZ+fWm46H8QqfoRrnwlZTk5mIqjHDcgi+SJhTWtw=; b=Br3YluVLuR6Ry7K8JR11i7Y6BwJ19Dy/SS6WvZZAGFao7VqxeQstljX9BKQYatqUH2U3rH axSSd2rIfWBlmyfaMa12nNRbc/B5dJqqSdy25DF0nC1nEAOXc9jMTwPnxZ1BSMYnR/T49x CPQiy+jEp9/hwLaVA9unYphnWPW5HHk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118462; 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=9yTAZ+fWm46H8QqfoRrnwlZTk5mIqjHDcgi+SJhTWtw=; b=MLgmOCvBzQ+4wPhXhi5GV8EsH1wxUxxiGUfGTH6NUSq1yo7nucXwNLckj5yvLlXfHg6gu2 1YwmvZcohBoEQVCg== 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 2C7AE13A6A; Mon, 6 Mar 2023 16:01:02 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id uHMGCj4OBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:01:02 +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 98/99] staging/sm750fb: Parse option string with struct option_iter Date: Mon, 6 Mar 2023 17:00:15 +0100 Message-Id: <20230306160016.4459-99-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 Use struct option_iter to walk over the individual options in the driver's option string. Replaces the hand-written strsep() loop with a clean interface. The helpers for struct option_iter handle empty option strings and empty options transparently. The struct's _init and _release functions duplicate and release the option string's memory buffer as needed. Done in preparation of constifying the option string. Signed-off-by: Thomas Zimmermann --- drivers/staging/sm750fb/sm750.c | 43 +++++++++++++++++---------------- 1 file changed, 22 insertions(+), 21 deletions(-) diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c index effc7fcc3703..2eb223f0631e 100644 --- a/drivers/staging/sm750fb/sm750.c +++ b/drivers/staging/sm750fb/sm750.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include +#include #include #include #include @@ -867,9 +868,10 @@ static int lynxfb_set_fbinfo(struct fb_info *info, int index) } /* chip specific g_option configuration routine */ -static void sm750fb_setup(struct sm750_dev *sm750_dev, char *src) +static void sm750fb_setup(struct sm750_dev *sm750_dev, const char *src) { - char *opt; + struct option_iter iter; + const char *opt; int swap; swap = 0; @@ -889,9 +891,12 @@ static void sm750fb_setup(struct sm750_dev *sm750_dev, char *src) goto NO_PARAM; } - while ((opt = strsep(&src, ":")) != NULL && *opt != 0) { + dev_info(&sm750_dev->pdev->dev, "src=%s\n", src); + + option_iter_init(&iter, src); + + while (option_iter_next(&iter, opt)) { dev_info(&sm750_dev->pdev->dev, "opt=%s\n", opt); - dev_info(&sm750_dev->pdev->dev, "src=%s\n", src); if (!strncmp(opt, "swap", strlen("swap"))) { swap = 1; @@ -924,6 +929,8 @@ static void sm750fb_setup(struct sm750_dev *sm750_dev, char *src) } } + option_iter_release(&iter); + NO_PARAM: if (sm750_dev->revid != SM750LE_REVISION_ID) { if (sm750_dev->fb_count > 1) { @@ -1096,10 +1103,12 @@ static void lynxfb_pci_remove(struct pci_dev *pdev) kfree(g_settings); } -static int __init lynxfb_setup(char *options) +static int __init lynxfb_setup(const char *options) { + struct option_iter iter; + const char *opt; int len; - char *opt, *tmp; + char *tmp; if (!options || !*options) { pr_warn("no options.\n"); @@ -1112,19 +1121,11 @@ static int __init lynxfb_setup(char *options) g_settings = kzalloc(len, GFP_KERNEL); if (!g_settings) return -ENOMEM; - tmp = g_settings; - /* - * Notes: - * char * strsep(char **s,const char * ct); - * @s: the string to be searched - * @ct :the characters to search for - * - * strsep() updates @options to pointer after the first found token - * it also returns the pointer ahead the token. - */ - while ((opt = strsep(&options, ":")) != NULL) { + option_iter_init(&iter, options); + + while (option_iter_next(&iter, opt)) { /* options that mean for any lynx chips are configured here */ if (!strncmp(opt, "noaccel", strlen("noaccel"))) { g_noaccel = 1; @@ -1133,15 +1134,15 @@ static int __init lynxfb_setup(char *options) } else if (!strncmp(opt, "dual", strlen("dual"))) { g_dualview = 1; } else { + if (tmp != g_settings) + *tmp++ = ':'; // add separator strcat(tmp, opt); tmp += strlen(opt); - if (options) - *tmp++ = ':'; - else - *tmp++ = 0; } } + option_iter_release(&iter); + /* misc g_settings are transport to chip specific routines */ pr_info("parameter left for chip specific analysis:%s\n", g_settings); return 0;