mptcp: free acked data before waiting for more memory

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After subflow lock is dropped, more wmem might have been made available.

This fixes a deadlock in mptcp_connect.sh 'mmap' mode: wmem is exhausted.
But as the mptcp socket holds on to already-acked data (for retransmit)
no wakeup will occur.

Using 'goto restart' calls mptcp_clean_una(sk) which will free pages
that have been acked completely in the mean time.

Fixes: fb529e62d3 ("mptcp: break and restart in case mptcp sndbuf is full")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Florian Westphal 2020-08-26 01:31:05 +02:00 • committed by David S. Miller

parent 09e31cf0c5

commit 1cec170d45

1 changed files with 1 additions and 2 deletions

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net/mptcp/protocol.c

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