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net/smc: don't wait for send buffer space when data was already sent

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[ Upstream commit 6889b36da7 ]

When there is no more send buffer space and at least 1 byte was already
sent then return to user space. The wait is only done when no data was
sent by the sendmsg() call.
This fixes smc_tx_sendmsg() which tried to always send all user data and
started to wait for free send buffer space when needed. During this wait
the user space program was blocked in the sendmsg() call and hence not
able to receive incoming data. When both sides were in such a situation
then the connection stalled forever.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Karsten Graul 2019-01-30 18:51:03 +01:00 committed by Greg Kroah-Hartman
parent f8e7423f5e
commit aa69ab5882
1 changed files with 3 additions and 4 deletions
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7
net/smc/smc_tx.c
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@ -163,12 +163,11 @@ int smc_tx_sendmsg(struct smc_sock *smc, struct msghdr *msg, size_t len)
conn->local_tx_ctrl.prod_flags.urg_data_pending = 1;
if (!atomic_read(&conn->sndbuf_space) || conn->urg_tx_pend) {
if (send_done)
return send_done;
rc = smc_tx_wait(smc, msg->msg_flags);
if (rc) {
if (send_done)
return send_done;
if (rc)
goto out_err;
}
continue;
}