Patch "iscsi-target: make sure to wake up sleeping login worker" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

iscsi-target: make sure to wake up sleeping login worker

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
iscsi-target-make-sure-to-wake-up-sleeping-login-worker.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Florian Westphal <[email protected]>
Date: Fri, 19 Jan 2018 14:36:29 +0100
Subject: iscsi-target: make sure to wake up sleeping login worker

From: Florian Westphal <[email protected]>

commit 1c130ae00b769a2e2df41bad3d6051ee8234b636 upstream.

Mike Christie reports:
Starting in 4.14 iscsi logins will fail around 50% of the time.

Problem appears to be that iscsi_target_sk_data_ready() callback may return without doing anything in case it finds the login work queue is still blocked in sock_recvmsg().

Nicholas Bellinger says:
It would indicate users providing their own ->sk_data_ready() callback must be responsible for waking up a kthread context blocked on sock_recvmsg(..., MSG_WAITALL), when a second ->sk_data_ready() is received before the first sock_recvmsg(..., MSG_WAITALL) completes.

So, do this and invoke the original data_ready() callback -- in case of tcp sockets this takes care of waking the thread.

Disclaimer: I do not understand why this problem did not show up before tcp prequeue removal.

(Drop WARN_ON usage - nab)

---
 drivers/target/iscsi/iscsi_target_nego.c |    3 +++
 1 file changed, 3 insertions(+)

@@ -432,6 +432,9 @@ static void iscsi_target_sk_data_ready(s
 	if (test_and_set_bit(LOGIN_FLAGS_READ_ACTIVE, &conn->login_flags)) {
 		write_unlock_bh(&sk->sk_callback_lock);
 		pr_debug("Got LOGIN_FLAGS_READ_ACTIVE=1, conn: %p >>>>\n", conn);
+		if (iscsi_target_sk_data_ready == conn->orig_data_ready)
+			return;
+		conn->orig_data_ready(sk);
 		return;
 	}
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/iscsi-target-make-sure-to-wake-up-sleeping-login-worker.patch