linux-kernel - [PATCH v2 035/101] fbdev/i810: Parse option string with struct option

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Message-Id: <20230309160201.5163-36-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:00:55 +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 035/101] fbdev/i810: 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/i810/i810_main.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/i810/i810_main.c b/drivers/video/fbdev/i810/i810_main.c
index 3b2648a2de29..952d1a69dfb9 100644
--- a/drivers/video/fbdev/i810/i810_main.c
+++ b/drivers/video/fbdev/i810/i810_main.c
@@ -29,6 +29,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1959,14 +1960,15 @@ static void i810fb_find_init_mode(struct fb_info *info)
 }
 
 #ifndef MODULE
-static int i810fb_setup(char *options)
+static int i810fb_setup(const char *options)
 {
-	char *this_opt, *suffix = NULL;
+	char *suffix = NULL;
+	struct option_iter iter;
+	char *this_opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, &this_opt)) {
 		if (!strncmp(this_opt, "mtrr", 4))
 			mtrr = true;
 		else if (!strncmp(this_opt, "accel", 5))
@@ -2009,6 +2011,9 @@ static int i810fb_setup(char *options)
 			mode_option = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif
-- 
2.39.2