netlink: Make groups check less stupid in netlink_bind()

As Linus noted, the test for 0 is needless, groups type can follow the
usual kernel style and 8*sizeof(unsigned long) is BITS_PER_LONG:

> The code [..] isn't technically incorrect...
> But it is stupid.
> Why stupid? Because the test for 0 is pointless.
>
> Just doing
>        if (nlk->ngroups < 8*sizeof(groups))
>                groups &= (1UL << nlk->ngroups) - 1;
>
> would have been fine and more understandable, since the "mask by shift
> count" already does the right thing for a ngroups value of 0. Now that
> test for zero makes me go "what's special about zero?". It turns out
> that the answer to that is "nothing".
[..]
> The type of "groups" is kind of silly too.
>
> Yeah, "long unsigned int" isn't _technically_ wrong. But we normally
> call that type "unsigned long".

Cleanup my piece of pointlessness.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: netdev@vger.kernel.org
Fairly-blamed-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 930d17fa906c9ebf1cf7b6031ce0a22f9f66c0e4..b4a29bcc33b9e909a328592e514ee232a177785b 100644 (file)
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -993,7 +993,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
        struct netlink_sock *nlk = nlk_sk(sk);
        struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;
        int err = 0;
-       long unsigned int groups = nladdr->nl_groups;
+       unsigned long groups = nladdr->nl_groups;
        bool bound;
 
        if (addr_len < sizeof(struct sockaddr_nl))
@@ -1011,9 +1011,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr,
                        return err;
        }
 
-       if (nlk->ngroups == 0)
-               groups = 0;
-       else if (nlk->ngroups < 8*sizeof(groups))
+       if (nlk->ngroups < BITS_PER_LONG)
                groups &= (1UL << nlk->ngroups) - 1;
 
        bound = nlk->bound;