tcp: Fix possible double-ack w/ user dma

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From: Ali Saidi <saidi@engin.umich.edu>

When TCP receive copy offload is enabled it's possible that
tcp_rcv_established() will cause two acks to be sent for a single
packet. In the case that a tcp_dma_early_copy() is successful,
copied_early is set to true which causes tcp_cleanup_rbuf() to be
called early which can send an ack. Further along in
tcp_rcv_established(), __tcp_ack_snd_check() is called and will
schedule a delayed ACK. If no packets are processed before the delayed
ack timer expires the packet will be acked twice.

Signed-off-by: David S. Miller <davem@davemloft.net>

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Ali Saidi 2008-10-07 15:31:19 -07:00 • committed by David S. Miller

parent b6c40d68ff

commit 53240c2087

1 changed files with 2 additions and 1 deletions

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net/ipv4/tcp_input.c

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