linux-kernel - [PATCH v2 040/101] fbdev/imxfb: Parse option string with struct option

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Message-Id: <20230309160201.5163-41-tzimmermann@suse.de>
Date:   Thu,  9 Mar 2023 17:01:00 +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 040/101] fbdev/imxfb: 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/imxfb.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c
index aad7d447385c..d4e347aca0b0 100644
--- a/drivers/video/fbdev/imxfb.c
+++ b/drivers/video/fbdev/imxfb.c
@@ -14,6 +14,7 @@
  *	linux-arm-kernel@...ts.arm.linux.org.uk
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -845,21 +846,21 @@ static struct lcd_ops imxfb_lcd_ops = {
 
 static int imxfb_setup(struct platform_device *pdev)
 {
-	char *opt, *options = NULL;
+	char *options = NULL;
+	struct option_iter iter;
+	char *opt;
 
 	if (fb_get_options("imxfb", &options))
 		return -ENODEV;
 
-	if (!options || !*options)
-		return 0;
-
-	while ((opt = strsep(&options, ",")) != NULL) {
-		if (!*opt)
-			continue;
+	option_iter_init(&iter, options);
 
+	while (option_iter_next(&iter, &opt)) {
 		fb_mode = devm_kstrdup(&pdev->dev, opt, GFP_KERNEL); // ignore errors
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2