linux-kernel - [PATCH 64/99] fbdev/pvr2fb: Parse option string with struct option

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Message-Id: <20230306160016.4459-65-tzimmermann@suse.de>
Date:   Mon,  6 Mar 2023 16:59:41 +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 64/99] fbdev/pvr2fb: 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/pvr2fb.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
index cd778f8753f1..9255b3506b81 100644
--- a/drivers/video/fbdev/pvr2fb.c
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -46,6 +46,7 @@
 #undef DEBUG
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1024,20 +1025,18 @@ static void pvr2fb_pci_exit(void)
  */
 
 #ifndef MODULE
-static int __init pvr2fb_setup(char *options)
+static int __init pvr2fb_setup(const char *options)
 {
-	char *this_opt;
 	char cable_arg[80];
 	char output_arg[80];
-
-	if (!options || !*options)
-		return 0;
+	struct option_iter iter;
+	const char *this_opt;
 
 	cable_arg[0] = output_arg[0] = 0;
 
-	while ((this_opt = strsep(&options, ","))) {
-		if (!*this_opt)
-			continue;
+	option_iter_init(&iter, options);
+
+	while (option_iter_next(&iter, this_opt)) {
 		if (!strcmp(this_opt, "inverse")) {
 			fb_invert_cmaps();
 		} else if (!strncmp(this_opt, "cable:", 6)) {
@@ -1061,6 +1060,8 @@ static int __init pvr2fb_setup(char *options)
 		}
 	}
 
+	option_iter_release(&iter);
+
 	if (*cable_arg)
 		cable_type = pvr2_get_param_val(cables, cable_arg, 3);
 	if (*output_arg)
-- 
2.39.2