linux-kernel - [PATCH 05/99] fbdev/acornfb: Parse option string with struct option

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Message-Id: <20230306160016.4459-6-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:58:42 +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 05/99] fbdev/acornfb: 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/acornfb.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/acornfb.c b/drivers/video/fbdev/acornfb.c
index 8642136a6bdc..1d6dec45615c 100644
--- a/drivers/video/fbdev/acornfb.c
+++ b/drivers/video/fbdev/acornfb.c
@@ -14,6 +14,7 @@
  *  - Blanking 8bpp displays with VIDC
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -879,17 +880,15 @@ static struct options {
 	{ NULL, NULL }
 };
 
-static int acornfb_setup(char *options)
+static int acornfb_setup(const char *options)
 {
-	struct options *optp;
-	char *opt;
+	struct option_iter iter;
+	const char *opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((opt = strsep(&options, ",")) != NULL) {
-		if (!*opt)
-			continue;
+	while (option_iter_next(&iter, opt)) {
+		struct options *optp;
 
 		for (optp = opt_table; optp->name; optp++) {
 			int optlen;
@@ -907,6 +906,9 @@ static int acornfb_setup(char *options)
 			printk(KERN_ERR "acornfb: unknown parameter: %s\n",
 			       opt);
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2