linux-kernel - [PATCH 14/99] fbdev/au1200fb: Parse option string with struct option

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Date:   Mon,  6 Mar 2023 16:58:51 +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 14/99] fbdev/au1200fb: 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/au1200fb.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/au1200fb.c b/drivers/video/fbdev/au1200fb.c
index 81c315454428..31a3f6afd8aa 100644
--- a/drivers/video/fbdev/au1200fb.c
+++ b/drivers/video/fbdev/au1200fb.c
@@ -31,6 +31,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/kernel.h>
@@ -1578,16 +1579,17 @@ static int au1200fb_init_fbinfo(struct au1200fb_device *fbdev)
 static int au1200fb_setup(struct au1200fb_platdata *pd)
 {
 	char *options = NULL;
-	char *this_opt, *endptr;
+	struct option_iter iter;
+	const char *this_opt;
+	char *endptr;
 	int num_panels = ARRAY_SIZE(known_lcd_panels);
 	int panel_idx = -1;
 
 	fb_get_options(DRIVER_NAME, &options);
 
-	if (!options)
-		goto out;
+	option_iter_init(&iter, options);
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, this_opt)) {
 		/* Panel option - can be panel name,
 		 * "bs" for board-switch, or number/index */
 		if (!strncmp(this_opt, "panel:", 6)) {
@@ -1636,7 +1638,8 @@ static int au1200fb_setup(struct au1200fb_platdata *pd)
 			print_warn("Unsupported option \"%s\"", this_opt);
 	}
 
-out:
+	option_iter_release(&iter);
+
 	return 0;
 }
 
-- 
2.39.2