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 <tzimmerm...@suse.de>
---
 drivers/video/fbdev/s3fb.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/video/fbdev/s3fb.c b/drivers/video/fbdev/s3fb.c
index 6bcedcde8aad..37f5ea25efd6 100644
--- a/drivers/video/fbdev/s3fb.c
+++ b/drivers/video/fbdev/s3fb.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/aperture.h>
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1521,18 +1522,15 @@ static struct pci_driver s3fb_pci_driver = {
 /* Parse user specified options */
 
 #ifndef MODULE
-static int  __init s3fb_setup(char *options)
+static int  __init s3fb_setup(const char *options)
 {
+       struct option_iter iter;
        char *opt;
 
-       if (!options || !*options)
-               return 0;
-
-       while ((opt = strsep(&options, ",")) != NULL) {
+       option_iter_init(&iter, options);
 
-               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 if (!strncmp(opt, "fasttext:", 9))
                        fasttext = simple_strtoul(opt + 9, NULL, 0);
@@ -1543,6 +1541,8 @@ static int  __init s3fb_setup(char *options)
                }
        }
 
+       option_iter_release(&iter);
+
        return 0;
 }
 #endif
-- 
2.39.2

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