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Date: Thu, 06 Mar 2014 23:18:43 +0000 From: David Howells <dhowells@...hat.com> To: netdev@...r.kernel.org Cc: dhowells@...hat.com, tim@...ctronghost.co.uk, linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: [PATCH 1/3] af_rxrpc: Remove incorrect checksum calculation from rxrpc_recvmsg() [ver #3] From: Tim Smith <tim@...ctronghost.co.uk> The UDP checksum was already verified in rxrpc_data_ready() - which calls skb_checksum_complete() - as the RxRPC packet header contains no checksum of its own. Subsequent calls to skb_copy_and_csum_datagram_iovec() are thus redundant and are, in any case, being passed only a subset of the UDP payload - so the checksum will always fail if that path is taken. So there is no need to check skb->ip_summed in rxrpc_recvmsg(), and no need for the csum_copy_error: exit path. Signed-off-by: Tim Smith <tim@...ctronghost.co.uk> Signed-off-by: David Howells <dhowells@...hat.com> --- net/rxrpc/ar-recvmsg.c | 25 +------------------------ 1 file changed, 1 insertion(+), 24 deletions(-) diff --git a/net/rxrpc/ar-recvmsg.c b/net/rxrpc/ar-recvmsg.c index 34b5490dde65..e9aaa65c0778 100644 --- a/net/rxrpc/ar-recvmsg.c +++ b/net/rxrpc/ar-recvmsg.c @@ -180,16 +180,7 @@ int rxrpc_recvmsg(struct kiocb *iocb, struct socket *sock, if (copy > len - copied) copy = len - copied; - if (skb->ip_summed == CHECKSUM_UNNECESSARY || - skb->ip_summed == CHECKSUM_PARTIAL) { - ret = skb_copy_datagram_iovec(skb, offset, - msg->msg_iov, copy); - } else { - ret = skb_copy_and_csum_datagram_iovec(skb, offset, - msg->msg_iov); - if (ret == -EINVAL) - goto csum_copy_error; - } + ret = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copy); if (ret < 0) goto copy_error; @@ -348,20 +339,6 @@ copy_error: _leave(" = %d", ret); return ret; -csum_copy_error: - _debug("csum error"); - release_sock(&rx->sk); - if (continue_call) - rxrpc_put_call(continue_call); - rxrpc_kill_skb(skb); - if (!(flags & MSG_PEEK)) { - if (skb_dequeue(&rx->sk.sk_receive_queue) != skb) - BUG(); - } - skb_kill_datagram(&rx->sk, skb, flags); - rxrpc_put_call(call); - return -EAGAIN; - wait_interrupted: ret = sock_intr_errno(timeo); wait_error: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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