Commit 9032f7676935 for kernel

commit 9032f7676935a13fd402608223d326c5f62da9c0
Author: D. Wythe <alibuda@linux.alibaba.com>
Date:   Wed May 6 09:41:05 2026 +0800

    net/smc: fix missing sk_err when TCP handshake fails

    In smc_connect_work(), when the underlying TCP handshake fails, the error
    code (rc) must be propagated to sk_err to ensure userspace can correctly
    retrieve the error status via SO_ERROR. Currently, the code only handles
    a restricted set of error codes (e.g., EPIPE, ECONNREFUSED). If other
    errors occurs, such as EHOSTUNREACH, sk_err remains unset (zero).

    This affects applications that rely on SO_ERROR to determine connect
    outcome. For example, higher versions of Go's netpoller treats
    SO_ERROR == 0 combined with a failed getpeername() as a spurious wakeup
    and re-enters epoll_wait(). Under ET mode, no further edge will be
    generated since the socket is already in a terminal state, causing the
    connect to hang indefinitely or until a user-specified timeout, if one
    is set.

    Fixes: 50717a37db03 ("net/smc: nonblocking connect rework")
    Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
    Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
    Link: https://patch.msgid.link/20260506014105.27093-1-alibuda@linux.alibaba.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 1a565095376a..185dbed7de5d 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1628,12 +1628,8 @@ static void smc_connect_work(struct work_struct *work)
 	lock_sock(&smc->sk);
 	if (rc != 0 || smc->sk.sk_err) {
 		smc->sk.sk_state = SMC_CLOSED;
-		if (rc == -EPIPE || rc == -EAGAIN)
-			smc->sk.sk_err = EPIPE;
-		else if (rc == -ECONNREFUSED)
-			smc->sk.sk_err = ECONNREFUSED;
-		else if (signal_pending(current))
-			smc->sk.sk_err = -sock_intr_errno(timeo);
+		if (!smc->sk.sk_err)
+			smc->sk.sk_err = (rc == -EAGAIN) ? EPIPE : -rc;
 		sock_put(&smc->sk); /* passive closing */
 		goto out;
 	}