netdev - Re: [PATCH target-pending] iscsi-target: make sure to wake up sleeping login worker

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Message-ID: <20180119172629.GD21673@breakpoint.cc>
Date:   Fri, 19 Jan 2018 18:26:29 +0100
From:   Florian Westphal <fw@...len.de>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Florian Westphal <fw@...len.de>, target-devel@...r.kernel.org,
        mchristi@...hat.com, nab@...ux-iscsi.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH target-pending] iscsi-target: make sure to wake up
 sleeping login worker

Eric Dumazet <eric.dumazet@...il.com> wrote:
> On Fri, 2018-01-19 at 14:36 +0100, Florian Westphal wrote:
> > diff --git a/drivers/target/iscsi/iscsi_target_nego.c b/drivers/target/iscsi/iscsi_target_nego.c
> > index b686e2ce9c0e..3723f8f419aa 100644
> > --- a/drivers/target/iscsi/iscsi_target_nego.c
> > +++ b/drivers/target/iscsi/iscsi_target_nego.c
> > @@ -432,6 +432,9 @@ static void iscsi_target_sk_data_ready(struct sock *sk)
> >  	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 (WARN_ON(iscsi_target_sk_data_ready == conn->orig_data_ready))
> > +			return;
> 
> Is this WARN_ON() belonging to this fix ?
> At least make it WARN_ON_ONCE() or pr_err_once()

Nicholas, I don't know this code at all so it would be good if you could
give advice here (omit all together, WARN_ON_ONCE, ...).

Thanks!