On 2019/9/11 3:22, Dan Carpenter wrote: > On Tue, Sep 10, 2019 at 09:57:10PM +0300, Dan Carpenter wrote: >> On Tue, Sep 10, 2019 at 03:13:42PM +0800, Mao Wenan wrote: >>> There are more parentheses in if clause when call sctp_get_port_local >>> in sctp_do_bind, and redundant assignment to 'ret'. This patch is to >>> do cleanup. >>> >>> Signed-off-by: Mao Wenan <maowenan@xxxxxxxxxx> >>> --- >>> net/sctp/socket.c | 3 +-- >>> 1 file changed, 1 insertion(+), 2 deletions(-) >>> >>> diff --git a/net/sctp/socket.c b/net/sctp/socket.c >>> index 9d1f83b10c0a..766b68b55ebe 100644 >>> --- a/net/sctp/socket.c >>> +++ b/net/sctp/socket.c >>> @@ -399,9 +399,8 @@ static int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len) >>> * detection. >>> */ >>> addr->v4.sin_port = htons(snum); >>> - if ((ret = sctp_get_port_local(sk, addr))) { >>> + if (sctp_get_port_local(sk, addr)) >>> return -EADDRINUSE; >> >> sctp_get_port_local() returns a long which is either 0,1 or a pointer >> casted to long. It's not documented what it means and neither of the >> callers use the return since commit 62208f12451f ("net: sctp: simplify >> sctp_get_port"). > > Actually it was commit 4e54064e0a13 ("sctp: Allow only 1 listening > socket with SO_REUSEADDR") from 11 years ago. That patch fixed a bug, > because before the code assumed that a pointer casted to an int was the > same as a pointer casted to a long. commit 4e54064e0a13 treated non-zero return value as unexpected, so the current cleanup is ok? > > regards, > dan carpenter > > > . >