linux-kernel - [PATCH v2 010/101] fbdev/atafb: Parse option string with struct option

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Message-Id: <20230309160201.5163-11-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:00:30 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, geert+renesas@...der.be, timur@...nel.org,
        rdunlap@...radead.org, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, adaplas@...il.com,
        s.hauer@...gutronix.de, shawnguo@...nel.org, mbroemme@...mpq.org,
        thomas@...ischhofer.net, James.Bottomley@...senPartnership.com,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        corbet@....net
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Thomas Zimmermann <tzimmermann@...e.de>
Subject: [PATCH v2 010/101] fbdev/atafb: Parse option string with struct option_iter

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.

v2:
	* add missing call to option_iter_init()

Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/video/fbdev/atafb.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/atafb.c b/drivers/video/fbdev/atafb.c
index f0cc7c992c88..6e625ac020b5 100644
--- a/drivers/video/fbdev/atafb.c
+++ b/drivers/video/fbdev/atafb.c
@@ -47,6 +47,7 @@
 #define ATAFB_EXT
 #define ATAFB_FALCON
 
+#include <linux/cmdline.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
@@ -2934,17 +2935,15 @@ static void __init atafb_setup_user(char *spec)
 	}
 }
 
-static int __init atafb_setup(char *options, struct platform_device *pdev)
+static int __init atafb_setup(const char *options, struct platform_device *pdev)
 {
+	struct option_iter iter;
 	char *this_opt;
 	int temp;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
-		if (!*this_opt)
-			continue;
+	while (option_iter_next(&iter, &this_opt)) {
 		if ((temp = get_video_mode(this_opt))) {
 			// ignore errors
 			mode_option = devm_kstrdup(&pdev->dev, this_opt, GFP_KERNEL);
@@ -2981,6 +2980,9 @@ static int __init atafb_setup(char *options, struct platform_device *pdev)
 		else if (!strncmp(this_opt, "R", 1))
 			atafb_setup_user(this_opt + 1);
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2