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| author |   Dave Barach <dave@barachs.net> | 2016-08-04 18:58:05 -0400 |
|---|---|---|
| committer |   Florin Coras <florin.coras@gmail.com> | 2016-08-05 13:21:59 +0000 |
| commit | 56faee837281c7f9c28aa40dbf0f6e4620b76be8 (patch) | |
| tree | 9fc45d3dca2bda5ff6c168fd943a9a6a55d0d2ab /vnet/vnet/ip/ip4_mtrie.c | |
| parent | 91c7d387fbfdf109f422c56ec5a4a21c9bbd9d02 (diff) | |
VPP-189 Clean up more coverity warnings
Change-Id: I1b971ab326dc334a4743fd7d4184cef106b0523d
Signed-off-by: Dave Barach <dave@barachs.net>
Diffstat (limited to 'vnet/vnet/ip/ip4_mtrie.c')
| -rw-r--r-- | vnet/vnet/ip/ip4_mtrie.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/vnet/vnet/ip/ip4_mtrie.c b/vnet/vnet/ip/ip4_mtrie.c index 461cd64b86d..0badde769c2 100644 --- a/vnet/vnet/ip/ip4_mtrie.c +++ b/vnet/vnet/ip/ip4_mtrie.c @@ -436,10 +436,26 @@ maybe_remap_leaf (ip_lookup_main_t * lm, ip4_fib_mtrie_leaf_t * p) if (m) { was_remapped_to_empty_leaf = m == ~0; + + /* + * The intent of the original form - which dates to 2013 or + * earlier - is not obvious. Here's the original: + * + * if (was_remapped_to_empty_leaf) + * p[0] = (was_remapped_to_empty_leaf + * ? IP4_FIB_MTRIE_LEAF_EMPTY + * : ip4_fib_mtrie_leaf_set_adj_index (m - 1)); + * + * Notice the outer "if (was_remapped_to_empty_leaf)" + * means that p[0] is always set to IP4_FIB_MTRIE_LEAF_EMPTY, + * and is otherwise left intact. + * + * It seems unlikely that the adjacency mapping scheme + * works in detail. Coverity correctly complains that the + * else-case of the original ternary expression is dead code. + */ if (was_remapped_to_empty_leaf) - p[0] = (was_remapped_to_empty_leaf - ? IP4_FIB_MTRIE_LEAF_EMPTY - : ip4_fib_mtrie_leaf_set_adj_index (m - 1)); + p[0] = IP4_FIB_MTRIE_LEAF_EMPTY; } } return was_remapped_to_empty_leaf; |