[PATCH v3 2/5] netlink: make validation_data const

[Johannes Berg]

From: Johannes Berg <johannes.b...@intel.com>

The validation data is only used within the policy that
should usually already be const, and isn't changed in any
code that uses it. Therefore, make the validation_data
pointer const.

While at it, remove the duplicate variable in the bitfield
validation that I'd otherwise have to change to const.

Reviewed-by: David Ahern <dsah...@gmail.com>
Signed-off-by: Johannes Berg <johannes.b...@intel.com>
---
 include/net/netlink.h | 2 +-
 lib/nlattr.c          | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/net/netlink.h b/include/net/netlink.h
index b680fe365e91..0d698215d4d9 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -237,7 +237,7 @@ enum {
 struct nla_policy {
        u16             type;
        u16             len;
-       void            *validation_data;
+       const void     *validation_data;
 };
 
 #define NLA_POLICY_EXACT_LEN(_len)     { .type = NLA_EXACT_LEN, .len = _len }
diff --git a/lib/nlattr.c b/lib/nlattr.c
index 120ad569e13d..e2e5b38394d5 100644
--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -45,12 +45,11 @@ static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = {
 };
 
 static int validate_nla_bitfield32(const struct nlattr *nla,
-                                  u32 *valid_flags_allowed)
+                                  const u32 *valid_flags_mask)
 {
        const struct nla_bitfield32 *bf = nla_data(nla);
-       u32 *valid_flags_mask = valid_flags_allowed;
 
-       if (!valid_flags_allowed)
+       if (!valid_flags_mask)
                return -EINVAL;
 
        /*disallow invalid bit selector */
-- 
2.14.4