netdev - Re: [PATCH net-next] net: filter: remove unused variable and fix warning

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Date:   Mon, 30 Oct 2017 21:13:28 +0000
From:   Lawrence Brakmo <brakmo@...com>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "oss-drivers@...ronome.com" <oss-drivers@...ronome.com>,
        "alexei.starovoitov@...il.com" <alexei.starovoitov@...il.com>,
        "daniel@...earbox.net" <daniel@...earbox.net>
Subject: Re: [PATCH net-next] net: filter: remove unused variable and fix
 warning

Good catch, thanks!

On 10/30/17, 1:47 PM, "Jakub Kicinski" <jakub.kicinski@...ronome.com> wrote:

    bpf_getsockopt bpf call sets the ret variable to zero and
    never changes it.  What's worse in case CONFIG_INET is
    not selected the variable is completely unused generating
    a warning.
    
    Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
    Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>

Acked-by: Lawrence Brakmo <brakmo@...com>
    ---
     net/core/filter.c | 3 +--
     1 file changed, 1 insertion(+), 2 deletions(-)
    
    diff --git a/net/core/filter.c b/net/core/filter.c
    index 721c30889033..a0112168d6f9 100644
    --- a/net/core/filter.c
    +++ b/net/core/filter.c
    @@ -3288,7 +3288,6 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
     	   int, level, int, optname, char *, optval, int, optlen)
     {
     	struct sock *sk = bpf_sock->sk;
    -	int ret = 0;
     
     	if (!sk_fullsock(sk))
     		goto err_clear;
    @@ -3308,7 +3307,7 @@ BPF_CALL_5(bpf_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
     	} else {
     		goto err_clear;
     	}
    -	return ret;
    +	return 0;
     #endif
     err_clear:
     	memset(optval, 0, optlen);
    -- 
    2.14.1