linux-kernel - [PATCH 65/99] fbdev/pxafb: Parse option string with struct option

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Message-Id: <20230306160016.4459-66-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:59:42 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     deller@....de, paulus@...ba.org, benh@...nel.crashing.org,
        linux@...linux.org.uk, pjones@...hat.com, timur@...nel.org,
        adaplas@...il.com, s.hauer@...gutronix.de, shawnguo@...nel.org,
        mbroemme@...mpq.org, thomas@...ischhofer.net,
        James.Bottomley@...senPartnership.com, spock@...too.org,
        sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
        geert+renesas@...der.be, 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 65/99] fbdev/pxafb: 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.

Signed-off-by: Thomas Zimmermann <tzimmermann@...e.de>
---
 drivers/video/fbdev/pxafb.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index c46ed78298ae..1937a58e47a1 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -32,6 +32,7 @@
  *   All Rights Reserved
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
@@ -2011,23 +2012,26 @@ static int parse_opt(struct device *dev, char *this_opt,
 	return 0;
 }
 
-static int pxafb_parse_options(struct device *dev, char *options,
+static int pxafb_parse_options(struct device *dev, const char *options,
 			       struct pxafb_mach_info *inf)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 	int ret;
 
-	if (!options || !*options)
-		return 0;
-
 	dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");
 
-	/* could be made table driven or similar?... */
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, this_opt)) {
+		/* could be made table driven or similar?... */
 		ret = parse_opt(dev, this_opt, inf);
 		if (ret)
 			return ret;
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2