linux-kernel - [PATCH 95/99] fbdev/vfb: Parse option string with struct option

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Message-Id: <20230306160016.4459-96-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 17:00:12 +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 95/99] fbdev/vfb: 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/vfb.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/vfb.c b/drivers/video/fbdev/vfb.c
index 15a6a0896ab5..ef22a6815e70 100644
--- a/drivers/video/fbdev/vfb.c
+++ b/drivers/video/fbdev/vfb.c
@@ -10,6 +10,7 @@
  *  more details.
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -392,9 +393,10 @@ static int vfb_mmap(struct fb_info *info,
  * The virtual framebuffer driver is only enabled if explicitly
  * requested by passing 'video=vfb:' (or any actual options).
  */
-static int __init vfb_setup(char *options)
+static int __init vfb_setup(const char *options)
 {
-	char *this_opt;
+	struct option_iter iter;
+	const char *this_opt;
 
 	vfb_enable = 0;
 
@@ -403,12 +405,9 @@ static int __init vfb_setup(char *options)
 
 	vfb_enable = 1;
 
-	if (!*options)
-		return 1;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
-		if (!*this_opt)
-			continue;
+	while (option_iter_next(&iter, this_opt)) {
 		/* Test disable for backwards compatibility */
 		if (!strcmp(this_opt, "disable"))
 			vfb_enable = 0;
@@ -424,6 +423,9 @@ static int __init vfb_setup(char *options)
 			mode_option = mode_option_buf;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 1;
 }
 #endif  /*  MODULE  */
-- 
2.39.2