gpio: aggregator: Replace custom get_arg() with a generic next_arg()

cmdline library provides next_arg() helper to traverse over parameters
and their values given in command line. Replace custom approach in the driver
by it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index 0817143..34e35b6 100644 (file)
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -37,31 +37,6 @@ struct gpio_aggregator {
 static DEFINE_MUTEX(gpio_aggregator_lock);     /* protects idr */
 static DEFINE_IDR(gpio_aggregator_idr);
 
-static char *get_arg(char **args)
-{
-       char *start, *end;
-
-       start = skip_spaces(*args);
-       if (!*start)
-               return NULL;
-
-       if (*start == '"') {
-               /* Quoted arg */
-               end = strchr(++start, '"');
-               if (!end)
-                       return ERR_PTR(-EINVAL);
-       } else {
-               /* Unquoted arg */
-               for (end = start; *end && !isspace(*end); end++) ;
-       }
-
-       if (*end)
-               *end++ = '\0';
-
-       *args = end;
-       return start;
-}
-
 static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
                         int hwnum, unsigned int *n)
 {
@@ -83,8 +58,8 @@ static int aggr_add_gpio(struct gpio_aggregator *aggr, const char *key,
 
 static int aggr_parse(struct gpio_aggregator *aggr)
 {
+       char *args = skip_spaces(aggr->args);
        char *name, *offsets, *p;
-       char *args = aggr->args;
        unsigned long *bitmap;
        unsigned int i, n = 0;
        int error = 0;
@@ -93,13 +68,9 @@ static int aggr_parse(struct gpio_aggregator *aggr)
        if (!bitmap)
                return -ENOMEM;
 
-       for (name = get_arg(&args), offsets = get_arg(&args); name;
-            offsets = get_arg(&args)) {
-               if (IS_ERR(name)) {
-                       pr_err("Cannot get GPIO specifier: %pe\n", name);
-                       error = PTR_ERR(name);
-                       goto free_bitmap;
-               }
+       args = next_arg(args, &name, &p);
+       while (*args) {
+               args = next_arg(args, &offsets, &p);
 
                p = get_options(offsets, 0, &error);
                if (error == 0 || *p) {
@@ -125,7 +96,7 @@ static int aggr_parse(struct gpio_aggregator *aggr)
                                goto free_bitmap;
                }
 
-               name = get_arg(&args);
+               args = next_arg(args, &name, &p);
        }
 
        if (!n) {