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mptcp: fix missing wakeup

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__mptcp_clean_una() can free write memory and should wake-up
user-space processes when needed.

When such function is invoked by the MPTCP receive path, the wakeup
is not needed, as the TCP stack will later trigger subflow_write_space
which will do the wakeup as needed.

Other __mptcp_clean_una() call sites need an additional wakeup check
Let's bundle the relevant code in a new helper and use it.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/165
Fixes: 6e628cd3a8 ("mptcp: use mptcp release_cb for delayed tasks")
Fixes: 64b9cea7a0 ("mptcp: fix spurious retransmissions")
Tested-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2021-03-04 13:32:15 -08:00 committed by David S. Miller
parent c2e6048fa1
commit 417789df4a
1 changed files with 8 additions and 2 deletions
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10
net/mptcp/protocol.c
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@ -1061,6 +1061,12 @@ out:
}
}
static void __mptcp_clean_una_wakeup(struct sock *sk)
{
__mptcp_clean_una(sk);
mptcp_write_space(sk);
}
static void mptcp_enter_memory_pressure(struct sock *sk)
{
struct mptcp_subflow_context *subflow;
@ -2270,7 +2276,7 @@ static void __mptcp_retrans(struct sock *sk)
struct sock *ssk;
int ret;
__mptcp_clean_una(sk);
__mptcp_clean_una_wakeup(sk);
dfrag = mptcp_rtx_head(sk);
if (!dfrag)
return;
@ -2983,7 +2989,7 @@ static void mptcp_release_cb(struct sock *sk)
}
if (test_and_clear_bit(MPTCP_CLEAN_UNA, &mptcp_sk(sk)->flags))
__mptcp_clean_una(sk);
__mptcp_clean_una_wakeup(sk);
if (test_and_clear_bit(MPTCP_ERROR_REPORT, &mptcp_sk(sk)->flags))
__mptcp_error_report(sk);