From:   Thomas Zimmermann <tzimmermann@suse.de>
To:     deller@gmx.de, geert+renesas@glider.be, timur@kernel.org,
        rdunlap@infradead.org, paulus@samba.org, benh@kernel.crashing.org,
        linux@armlinux.org.uk, pjones@redhat.com, adaplas@gmail.com,
        s.hauer@pengutronix.de, shawnguo@kernel.org, mbroemme@libmpq.org,
        thomas@winischhofer.net, James.Bottomley@HansenPartnership.com,
        sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com,
        corbet@lwn.net
Cc:     linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org,
        Thomas Zimmermann <tzimmermann@suse.de>
Subject: [PATCH v2 065/101] fbdev/pxafb: Parse option string with struct option_iter
Date:   Thu,  9 Mar 2023 17:01:25 +0100
Message-Id: <20230309160201.5163-66-tzimmermann@suse.de>
In-Reply-To: <20230309160201.5163-1-tzimmermann@suse.de>
References: <20230309160201.5163-1-tzimmermann@suse.de>
MIME-Version: 1.0
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Precedence: bulk

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@suse.de>
---
 drivers/video/fbdev/pxafb.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index c46ed78298ae..d2db9c20d515 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -32,6 +32,7 @@
  *   All Rights Reserved
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/kernel.h>
@@ -2011,23 +2012,26 @@ static int parse_opt(struct device *dev, char *this_opt,
 	return 0;
 }
 
-static int pxafb_parse_options(struct device *dev, char *options,
+static int pxafb_parse_options(struct device *dev, const char *options,
 			       struct pxafb_mach_info *inf)
 {
+	struct option_iter iter;
 	char *this_opt;
 	int ret;
 
-	if (!options || !*options)
-		return 0;
-
 	dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");
 
-	/* could be made table driven or similar?... */
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, &this_opt)) {
+		/* could be made table driven or similar?... */
 		ret = parse_opt(dev, this_opt, inf);
 		if (ret)
 			return ret;
 	}
+
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2