linux-kernel - [PATCH 54/99] fbdev/omapfb: Parse option string with struct option

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Date:   Mon,  6 Mar 2023 16:59:31 +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 54/99] fbdev/omapfb: 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/omap/omapfb_main.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/omap/omapfb_main.c b/drivers/video/fbdev/omap/omapfb_main.c
index 1f3df2055ff0..464a667708db 100644
--- a/drivers/video/fbdev/omap/omapfb_main.c
+++ b/drivers/video/fbdev/omap/omapfb_main.c
@@ -11,6 +11,7 @@
  *   Dirk Behme <dirk.behme@...bosch.com>  - changes for 2.6 kernel API
  *   Texas Instruments                     - H3 support
  */
+#include <linux/cmdline.h>
 #include <linux/platform_device.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
@@ -1842,17 +1843,17 @@ static struct platform_driver omapfb_driver = {
 #ifndef MODULE
 
 /* Process kernel command line parameters */
-static int __init omapfb_setup(char *options)
+static int __init omapfb_setup(const char *options)
 {
-	char *this_opt = NULL;
+	struct option_iter iter;
+	const char *this_opt;
 	int r = 0;
 
 	pr_debug("omapfb: options %s\n", options);
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while (!r && (this_opt = strsep(&options, ",")) != NULL) {
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strncmp(this_opt, "accel", 5))
 			def_accel = 1;
 		else if (!strncmp(this_opt, "vram:", 5)) {
@@ -1893,6 +1894,8 @@ static int __init omapfb_setup(char *options)
 		}
 	}
 
+	option_iter_release(&iter);
+
 	return r;
 }
 
-- 
2.39.2