[DCCP]: Remove unused and redundant validation functions

This removes two inlines which were both called in a single function only:

 1) dccp_feat_change() is always called with either DCCPO_CHANGE_L or DCCPO_CHANGE_R as argument
    * from dccp_set_socktopt_change() via do_dccp_setsockopt() with DCCP_SOCKOPT_CHANGE_R/L
    * from __dccp_feat_init() via dccp_feat_init() also with DCCP_SOCKOPT_CHANGE_R/L.

    Hence the dccp_feat_is_valid_type() is completely unnecessary and always returns true.

 2) Due to (1), the length test reduces to 'len >= 4', which in turn makes
    dccp_feat_is_valid_length() unnecessary.

Furthermore, the inline function dccp_feat_is_reserved() was unfolded,
since only called in a single place.

Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 8 deletions

diff --git a/net/dccp/feat.c b/net/dccp/feat.c
index 5ebdd86c1b99..084744e624d3 100644
--- a/net/dccp/feat.c
+++ b/net/dccp/feat.c
@@ -24,11 +24,7 @@ int dccp_feat_change(struct dccp_minisock *dmsk, u8 type, u8 feature,
 
         dccp_feat_debug(type, feature, *val);
 
-        if (!dccp_feat_is_valid_type(type)) {
-                DCCP_WARN("option type %d invalid in negotiation\n", type);
-                return 1;
-        }
-        if (!dccp_feat_is_valid_length(type, feature, len)) {
+        if (len > 3) {
                 DCCP_WARN("invalid length %d\n", len);
                 return 1;
         }
@@ -637,12 +633,12 @@ const char *dccp_feat_name(const u8 feat)
                 [DCCPF_MIN_CSUM_COVER]  = "Min. Csum Coverage",
                 [DCCPF_DATA_CHECKSUM]   = "Send Data Checksum",
         };
+        if (feat > DCCPF_DATA_CHECKSUM && feat < DCCPF_MIN_CCID_SPECIFIC)
+                return feature_names[DCCPF_RESERVED];
+
         if (feat >= DCCPF_MIN_CCID_SPECIFIC)
                 return "CCID-specific";
 
-        if (dccp_feat_is_reserved(feat))
-                return feature_names[DCCPF_RESERVED];
-
         return feature_names[feat];
 }