linux-kernel - [PATCH 18/99] fbdev/controlfb: Parse option string with struct option

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Message-Id: <20230306160016.4459-19-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:58:55 +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 18/99] fbdev/controlfb: 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/controlfb.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/controlfb.c b/drivers/video/fbdev/controlfb.c
index 82eeb139c4eb..3633e874ab2e 100644
--- a/drivers/video/fbdev/controlfb.c
+++ b/drivers/video/fbdev/controlfb.c
@@ -31,6 +31,7 @@
  *  more details.
  */
 
+#include <linux/cmdline.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/string.h>
@@ -795,14 +796,14 @@ static void __init control_init_info(struct fb_info *info, struct fb_info_contro
 /*
  * Parse user specified options (`video=controlfb:')
  */
-static void __init control_setup(char *options)
+static void __init control_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
-	if (!options || !*options)
-		return;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "vmode:", 6)) {
 			int vmode = simple_strtoul(this_opt+6, NULL, 0);
 			if (vmode > 0 && vmode <= VMODE_MAX &&
@@ -830,6 +831,8 @@ static void __init control_setup(char *options)
 			}
 		}
 	}
+
+	option_iter_release(&iter);
 }
 
 /*
-- 
2.39.2