linux-kernel - [PATCH v2 083/101] fbdev/tgafb: Parse option string with struct option

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Message-Id: <20230309160201.5163-84-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:43 +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 083/101] fbdev/tgafb: 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/tgafb.c | 28 ++++++++++++++--------------
 1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/video/fbdev/tgafb.c b/drivers/video/fbdev/tgafb.c
index cf00b8a91bfb..0862d9a54aef 100644
--- a/drivers/video/fbdev/tgafb.c
+++ b/drivers/video/fbdev/tgafb.c
@@ -14,6 +14,7 @@
 
 #include <linux/aperture.h>
 #include <linux/bitrev.h>
+#include <linux/cmdline.h>
 #include <linux/compiler.h>
 #include <linux/delay.h>
 #include <linux/device.h>
@@ -1573,25 +1574,24 @@ static void tgafb_exit(void)
 }
 
 #ifndef MODULE
-static int tgafb_setup(char *arg)
+static int tgafb_setup(const char *arg)
 {
+	struct option_iter iter;
 	char *this_opt;
 
-	if (arg && *arg) {
-		while ((this_opt = strsep(&arg, ","))) {
-			if (!*this_opt)
-				continue;
-			if (!strncmp(this_opt, "mode:", 5)) {
-				kfree(mode_option_buf);
-				mode_option_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors
-				mode_option = mode_option_buf;
-			} else
-				printk(KERN_ERR
-				       "tgafb: unknown parameter %s\n",
-				       this_opt);
-		}
+	option_iter_init(&iter, arg);
+
+	while (option_iter_next(&iter, &this_opt)) {
+		if (!strncmp(this_opt, "mode:", 5)) {
+			kfree(mode_option_buf);
+			mode_option_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors
+			mode_option = mode_option_buf;
+		} else
+			printk(KERN_ERR "tgafb: unknown parameter %s\n", this_opt);
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif /* !MODULE */
-- 
2.39.2