linux-kernel - [PATCH 74/99] fbdev/skeletonfb: Parse option string with struct option

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Message-Id: <20230306160016.4459-75-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:59:51 +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 74/99] fbdev/skeletonfb: 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/skeletonfb.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/skeletonfb.c b/drivers/video/fbdev/skeletonfb.c
index 40c130ab6b38..1e876ad2a261 100644
--- a/drivers/video/fbdev/skeletonfb.c
+++ b/drivers/video/fbdev/skeletonfb.c
@@ -43,6 +43,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -973,9 +974,19 @@ static struct platform_device *xxxfb_device;
  * Only necessary if your driver takes special options,
  * otherwise we fall back on the generic fb_setup().
  */
-static int __init xxxfb_setup(char *options)
+static int __init xxxfb_setup(const char *options)
 {
-    /* Parse user specified options (`video=xxxfb:') */
+	/* Parse user-specified options (`video=xxxfb:') */
+
+	struct option_iter iter;
+	const char *this_opt;
+
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, this_opt)) {
+	}
+
+	option_iter_release(&iter);
 }
 #endif /* MODULE */
 
-- 
2.39.2