4.18-stable review patch. If anyone has any objections, please let me know.
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From: Ursula Braun ubraun@linux.ibm.com
[ Upstream commit 648a5a7aed346c3b8fe7c32a835edfb0dfbf4451 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/smc/af_smc.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)
--- a/net/smc/af_smc.c +++ b/net/smc/af_smc.c @@ -612,7 +612,10 @@ static void smc_connect_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); @@ -1345,7 +1348,7 @@ static __poll_t smc_poll(struct file *fi 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;