linux-kernel - [PATCH 96/99] fbdev/viafb: Parse option string with struct option

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Date:   Mon,  6 Mar 2023 17:00:13 +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 96/99] fbdev/viafb: 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/via/viafbdev.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/via/viafbdev.c b/drivers/video/fbdev/via/viafbdev.c
index 2d67c92c5774..4f39319e21f8 100644
--- a/drivers/video/fbdev/via/viafbdev.c
+++ b/drivers/video/fbdev/via/viafbdev.c
@@ -5,6 +5,7 @@
 
  */
 
+#include <linux/cmdline.h>
 #include <linux/compiler.h>
 #include <linux/module.h>
 #include <linux/seq_file.h>
@@ -1922,21 +1923,18 @@ void via_fb_pci_remove(struct pci_dev *pdev)
 #ifndef MODULE
 static int __init viafb_setup(void)
 {
-	char *this_opt;
 	char *options;
+	struct option_iter iter;
+	const char *this_opt;
 
 	DEBUG_MSG(KERN_INFO "viafb_setup!\n");
 
 	if (fb_get_options("viafb", &options))
 		return -ENODEV;
 
-	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 (!strncmp(this_opt, "viafb_mode1=", 12)) {
 			viafb_mode1 = kstrdup(this_opt + 12, GFP_KERNEL);
 			if (!viafb_mode1)
@@ -2009,6 +2007,9 @@ static int __init viafb_setup(void)
 				return -ENOMEM;
 		}
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif
-- 
2.39.2