[PATCH 4/8] lib: bitmap: move ERANGE check from set_region to check_region

[Paul Gortmaker]

It makes sense to do all the checks in check_region() and not 1/2
in check_region and 1/2 in set_region.

Since set_region is called immediately after check_region, the net
effect on runtime is zero, but it gets rid of an if (...) return...

Cc: Yury Norov <yury.no...@gmail.com>
Cc: Rasmus Villemoes <li...@rasmusvillemoes.dk>
Cc: Andy Shevchenko <andriy.shevche...@linux.intel.com>
Acked-by: Yury Norov <yury.no...@gmail.com>
Signed-off-by: Paul Gortmaker <paul.gortma...@windriver.com>
---
 lib/bitmap.c | 19 +++++++------------
 1 file changed, 7 insertions(+), 12 deletions(-)

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 75006c4036e9..9596ba53c36b 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -499,25 +499,22 @@ struct region {
        unsigned int end;
 };
 
-static int bitmap_set_region(const struct region *r,
-                               unsigned long *bitmap, int nbits)
+static void bitmap_set_region(const struct region *r, unsigned long *bitmap)
 {
        unsigned int start;
 
-       if (r->end >= nbits)
-               return -ERANGE;
-
        for (start = r->start; start <= r->end; start += r->group_len)
                bitmap_set(bitmap, start, min(r->end - start + 1, r->off));
-
-       return 0;
 }
 
-static int bitmap_check_region(const struct region *r)
+static int bitmap_check_region(const struct region *r, int nbits)
 {
        if (r->start > r->end || r->group_len == 0 || r->off > r->group_len)
                return -EINVAL;
 
+       if (r->end >= nbits)
+               return -ERANGE;
+
        return 0;
 }
 
@@ -651,13 +648,11 @@ int bitmap_parselist(const char *buf, unsigned long 
*maskp, int nmaskbits)
                if (IS_ERR(buf))
                        return PTR_ERR(buf);
 
-               ret = bitmap_check_region(&r);
+               ret = bitmap_check_region(&r, nmaskbits);
                if (ret)
                        return ret;
 
-               ret = bitmap_set_region(&r, maskp, nmaskbits);
-               if (ret)
-                       return ret;
+               bitmap_set_region(&r, maskp);
        }
 
        return 0;
-- 
2.17.1