[PATCH 33/99] fbdev/i740fb: Parse option string with struct option_iter

[Thomas Zimmermann]

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@xxxxxxx>
---
 drivers/video/fbdev/i740fb.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/i740fb.c b/drivers/video/fbdev/i740fb.c
index dd4b5c717e8e..cf45d6280f38 100644
--- a/drivers/video/fbdev/i740fb.c
+++ b/drivers/video/fbdev/i740fb.c
@@ -13,6 +13,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1261,17 +1262,15 @@ static struct pci_driver i740fb_driver = {
 };
 
 #ifndef MODULE
-static int  __init i740fb_setup(char *options)
+static int  __init i740fb_setup(const char *options)
 {
-	char *opt;
+	struct option_iter iter;
+	const char *opt;
 
-	if (!options || !*options)
-		return 0;
+	option_iter_init(&iter, options);
 
-	while ((opt = strsep(&options, ",")) != NULL) {
-		if (!*opt)
-			continue;
-		else if (!strncmp(opt, "mtrr:", 5))
+	while (option_iter_next(&iter, opt)) {
+		if (!strncmp(opt, "mtrr:", 5))
 			mtrr = simple_strtoul(opt + 5, NULL, 0);
 		else {
 			static char mode_option_buf[256];
@@ -1286,6 +1285,8 @@ static int  __init i740fb_setup(char *options)
 		}
 	}
 
+	option_iter_release(&iter);
+
 	return 0;
 }
 #endif
-- 
2.39.2