[PATCH v2 090/101] fbdev/valkyriefb: 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 <tzimmerm...@suse.de>
---
 drivers/video/fbdev/valkyriefb.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/valkyriefb.c b/drivers/video/fbdev/valkyriefb.c
index b166b7cfe0e5..3c20f392370a 100644
--- a/drivers/video/fbdev/valkyriefb.c
+++ b/drivers/video/fbdev/valkyriefb.c
@@ -39,6 +39,7 @@
  *  more details.
  */
 
+#include <linux/cmdline.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -90,7 +91,7 @@ struct fb_info_valkyrie {
        u32                     pseudo_palette[16];
 };
 
-static int valkyriefb_setup(char*);
+static int valkyriefb_setup(const char *options);
 
 static int valkyriefb_check_var(struct fb_var_screeninfo *var,
                                struct fb_info *info);
@@ -545,14 +546,14 @@ static int __init valkyrie_init_info(struct fb_info *info,
 /*
  * Parse user specified options (`video=valkyriefb:')
  */
-static int __init valkyriefb_setup(char *options)
+static int __init valkyriefb_setup(const char *options)
 {
+       struct option_iter iter;
        char *this_opt;
 
-       if (!options || !*options)
-               return 0;
+       option_iter_init(&iter, options);
 
-       while ((this_opt = strsep(&options, ",")) != NULL) {
+       while (option_iter_next(&iter, &this_opt)) {
                if (!strncmp(this_opt, "vmode:", 6)) {
                        int vmode = simple_strtoul(this_opt+6, NULL, 0);
                        if (vmode > 0 && vmode <= VMODE_MAX)
@@ -571,6 +572,9 @@ static int __init valkyriefb_setup(char *options)
                        }
                }
        }
+
+       option_iter_release(&iter);
+
        return 0;
 }
 
-- 
2.39.2