linux-kernel - [PATCH 53/99] fbdev/ocfb: Parse option string with struct option

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Message-Id: <20230306160016.4459-54-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:59:30 +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 53/99] fbdev/ocfb: 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/ocfb.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/ocfb.c b/drivers/video/fbdev/ocfb.c
index 34684191f2f0..546230483f53 100644
--- a/drivers/video/fbdev/ocfb.c
+++ b/drivers/video/fbdev/ocfb.c
@@ -8,6 +8,7 @@
  * kind, whether express or implied.
  */
 
+#include <linux/cmdline.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/errno.h>
@@ -67,20 +68,17 @@ struct ocfb_dev {
 };
 
 #ifndef MODULE
-static int __init ocfb_setup(char *options)
+static int __init ocfb_setup(const char *options)
 {
-	char *curr_opt;
+	struct option_iter iter;
+	const char *curr_opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((curr_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, curr_opt)) {
 		static char mode_option_buf[256];
 		int ret;
 
-		if (!*curr_opt)
-			continue;
-
 		ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", curr_opt);
 		if (WARN(ret < 0, "ocfb: ignoring invalid option, ret=%d\n", ret))
 			continue;
@@ -89,6 +87,8 @@ static int __init ocfb_setup(char *options)
 		mode_option = mode_option_buf;
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif
-- 
2.39.2