linux-kernel - [PATCH net-next] ethtool: Remove unnecessary null check in ethtool_rx_flow_rule

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Message-Id: <20190208044652.32166-1-natechancellor@gmail.com>
Date:   Thu,  7 Feb 2019 21:46:53 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Jiri Pirko <jiri@...lanox.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH net-next] ethtool: Remove unnecessary null check in ethtool_rx_flow_rule_create

net/core/ethtool.c:3023:19: warning: address of array
'ext_m_spec->h_dest' will always evaluate to 'true'
[-Wpointer-bool-conversion]
                if (ext_m_spec->h_dest) {
                ~~  ~~~~~~~~~~~~^~~~~~

h_dest is an array, it can't be null so remove this check.

Fixes: eca4205f9ec3 ("ethtool: add ethtool_rx_flow_spec to flow_rule structure translator")
Link: https://github.com/ClangBuiltLinux/linux/issues/353
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 net/core/ethtool.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/net/core/ethtool.c b/net/core/ethtool.c
index 0fbf39239b29..d2c47cdf25da 100644
--- a/net/core/ethtool.c
+++ b/net/core/ethtool.c
@@ -3020,17 +3020,15 @@ ethtool_rx_flow_rule_create(const struct ethtool_rx_flow_spec_input *input)
 		const struct ethtool_flow_ext *ext_h_spec = &fs->h_ext;
 		const struct ethtool_flow_ext *ext_m_spec = &fs->m_ext;
 
-		if (ext_m_spec->h_dest) {
-			memcpy(match->key.eth_addrs.dst, ext_h_spec->h_dest,
-			       ETH_ALEN);
-			memcpy(match->mask.eth_addrs.dst, ext_m_spec->h_dest,
-			       ETH_ALEN);
-
-			match->dissector.used_keys |=
-				BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS);
-			match->dissector.offset[FLOW_DISSECTOR_KEY_ETH_ADDRS] =
-				offsetof(struct ethtool_rx_flow_key, eth_addrs);
-		}
+		memcpy(match->key.eth_addrs.dst, ext_h_spec->h_dest,
+		       ETH_ALEN);
+		memcpy(match->mask.eth_addrs.dst, ext_m_spec->h_dest,
+		       ETH_ALEN);
+
+		match->dissector.used_keys |=
+			BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS);
+		match->dissector.offset[FLOW_DISSECTOR_KEY_ETH_ADDRS] =
+			offsetof(struct ethtool_rx_flow_key, eth_addrs);
 	}
 
 	act = &flow->rule->action.entries[0];
-- 
2.20.1