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net/smc: fix non-blocking connect problem

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In state SMC_INIT smc_poll() delegates polling to the internal
CLC socket. This means, once the connect worker has finished
its kernel_connect() step, the poll wake-up may occur. This is not
intended. The wake-up should occur from the wake up call in
smc_connect_work() after __smc_connect() has finished.
Thus in state SMC_INIT this patch now calls sock_poll_wait() on the
main SMC socket.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2018-09-18 15:46:34 +02:00 committed by David S. Miller
parent 2fe397a395
commit 648a5a7aed
1 changed files with 5 additions and 2 deletions
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7
net/smc/af_smc.c
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@ -742,7 +742,10 @@ static void smc_connect_work(struct work_struct *work)
smc->sk.sk_err = -rc;
out:
smc->sk.sk_state_change(&smc->sk);
if (smc->sk.sk_err)
smc->sk.sk_state_change(&smc->sk);
else
smc->sk.sk_write_space(&smc->sk);
kfree(smc->connect_info);
smc->connect_info = NULL;
release_sock(&smc->sk);
@ -1529,7 +1532,7 @@ static __poll_t smc_poll(struct file *file, struct socket *sock,
return EPOLLNVAL;
smc = smc_sk(sock->sk);
if ((sk->sk_state == SMC_INIT) || smc->use_fallback) {
if (smc->use_fallback) {
/* delegate to CLC child sock */
mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
sk->sk_err = smc->clcsock->sk->sk_err;