On Fri, Sep 28, 2018 at 12:03:22PM -0700, Cong Wang wrote:
> On Fri, Sep 28, 2018 at 12:02 PM Cong Wang <[email protected]> wrote:
> >
> > On Fri, Sep 28, 2018 at 11:26 AM Dave Jones <[email protected]>
> > wrote:
> > > diff --git a/net/core/netpoll.c b/net/core/netpoll.c
> > > index 3219a2932463..4f9494381635 100644
> > > --- a/net/core/netpoll.c
> > > +++ b/net/core/netpoll.c
> > > @@ -330,6 +330,7 @@ void netpoll_send_skb_on_dev(struct netpoll *np,
> > > struct sk_buff *skb,
> > > /* It is up to the caller to keep npinfo alive. */
> > > struct netpoll_info *npinfo;
> > >
> > > + rcu_read_lock();
> > > lockdep_assert_irqs_disabled();
> > >
> > > npinfo = rcu_dereference_bh(np->dev->npinfo);
> >
> > I think you probably need rcu_read_lock_bh() to satisfy
> > rcu_deference_bh()...
>
> But irq is disabled here, so not sure if rcu_read_lock_bh()
> could cause trouble... Interesting...
I was wondering for a moment why I never got a warning, then I
remembered I disabled lockdep for that machine because nfs spews stuff.
I'll doublecheck, and post v4. lol, this looked like a 2 minute fix at first.
Dave
