linux-kernel - [PATCH v2 073/101] fbdev/sisfb: Parse option string with struct option

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Message-Id: <20230309160201.5163-74-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:33 +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 073/101] fbdev/sisfb: 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/sis/sis_main.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/sis/sis_main.c b/drivers/video/fbdev/sis/sis_main.c
index c16493d3ac4f..9f63812a5f66 100644
--- a/drivers/video/fbdev/sis/sis_main.c
+++ b/drivers/video/fbdev/sis/sis_main.c
@@ -20,6 +20,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
@@ -54,7 +55,7 @@
 
 /* Interface used by the world */
 #ifndef MODULE
-static int sisfb_setup(char *options);
+static int sisfb_setup(const char *options);
 #endif
 
 /* Interface to the low level console driver */
@@ -3987,19 +3988,16 @@ sisfb_handle_command(struct sis_video_info *ivideo, struct sisfb_cmd *sisfb_comm
 }
 
 #ifndef MODULE
-static int __init sisfb_setup(char *options)
+static int __init sisfb_setup(const char *options)
 {
+	struct option_iter iter;
 	char *this_opt;
 
 	sisfb_setdefaultparms();
 
-	if(!options || !(*options))
-		return 0;
-
-	while((this_opt = strsep(&options, ",")) != NULL) {
-
-		if(!(*this_opt)) continue;
+	option_iter_init(&iter, options);
 
+	while (option_iter_next(&iter, &this_opt)) {
 		if(!strncasecmp(this_opt, "off", 3)) {
 			sisfb_off = 1;
 		} else if(!strncasecmp(this_opt, "forcecrt2type:", 14)) {
@@ -4081,6 +4079,8 @@ static int __init sisfb_setup(char *options)
 
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif
-- 
2.39.2