| Re: [PATCH 2.6.18] e1000: fix initialization irqs [message #8519 is a reply to message #8517] |
Wed, 22 November 2006 16:43   |
Mishin Dmitry
Messages: 112
Registered: February 2006
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Senior Member |
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On Wednesday 22 November 2006 19:19, Auke Kok wrote:
> Dmitry Mishin wrote:
> > In case of irqpoll boot option set, e1000 may oops due to:
> > 1) e1000 register it's handler with e1000_request_irq
> > 2) spurious interrupt happens
> > 3) kernel tries to handle this interrupt with all available descs
> > 4) e1000_intr is called and oops due to not initialized clean_rx handler,
> > because e1000_up is not called yet.
> >
> > Solution is to initialize driver before handler registration.
>
> I'm not so sure of that. even if we request our irq's to be routed it does not mean that
> we told the NIC to send them. It would suggest that you might be haunted by the MSI
> interrupts not working 100% correctly on some non-intel platform.
>
> Now you're telling the NIC to send interrupts before we routed them I think.
>
> If we _up() before we even have an interrupt, even more bad things could happen.
>
> What is the reason you wrote this workaround?
The reason is simple, we've got this oops due to misrouted interrupts,
misrouted_irq() function. This workaround helps us, please, advice how to fix
it or fix it yourself.
>
> Auke
>
> >
> > Signed-off-by: Dmitry Mishin <dim@openvz.org>
> > Signed-off-by: Pavel Emelianov <xemul@openvz.org>
> >
> > ---
> > e1000_main.c | 9 +++++----
> > 1 file changed, 5 insertions(+), 4 deletions(-)
> >
> > ---
> > --- ./drivers/net/e1000/e1000_main.c.e1000 2006-09-20 07:42:06.000000000 +0400
> > +++ ./drivers/net/e1000/e1000_main.c 2006-11-22 14:08:15.000000000 +0300
> > @@ -1206,14 +1206,15 @@ e1000_open(struct net_device *netdev)
> > if ((err = e1000_setup_all_rx_resources(adapter)))
> > goto err_setup_rx;
> >
> > - err = e1000_request_irq(adapter);
> > - if (err)
> > - goto err_up;
> > -
> > e1000_power_up_phy(adapter);
> >
> > if ((err = e1000_up(adapter)))
> > goto err_up;
> > +
> > + err = e1000_request_irq(adapter);
> > + if (err)
> > + goto err_up;
> > +
> > adapter->mng_vlan_id = E1000_MNG_VLAN_NONE;
> > if ((adapter->hw.mng_cookie.status &
> > E1000_MNG_DHCP_COOKIE_STATUS_VLAN_SUPPORT)) {
> > -
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>
--
Thanks,
Dmitry.
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