On Fri, 20 Oct 2006 23:16:03 +0200
Andi Kleen <[email protected]> wrote:
> On Friday 20 October 2006 23:08, David Miller wrote:
> > From: Andi Kleen <[email protected]>
> > Date: Fri, 20 Oct 2006 23:01:29 +0200
> >
> > > netpoll always played a little fast'n'lose with various locking rules.
> >
> > The current code is fine, it never reenters ->poll, because it
> > maintains a "->poll_owner" which it checks in netpoll_send_skb()
> > before trying to call back into ->poll.
>
> I was more thinking of reentry of the interrupt handler in
> the driver etc. A lot of them also do printk, but that is fortunately
> caught higher level.
>
> -Andi
One problem is that with netconsole the NAPI poll routine can be
called with IRQ's disabled. This means that calls to dev_kfree_skb()
are incorrect in this context. The driver would have to use dev_kfree_skb_any()
instead.
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