Re: [Linux-ATM-General] Fwd: Re: [PATCH] pppoatm carrier status

[chas w. - C. <ch...@cm...>]

On Tue, 21 Sep 2010 21:19:45 -0700
Philip Prindeville <phi...@re...> wrote:


> BUG: unable to handle kernel NULL pointer dereference at 00000090

like it said, null pointer dereference.  i.e. (null)->something

> IP: [<e0133050>] :ppp_generic:ppp_channel_carrier_on+0x16/0x31

very early in ppp_channel_carrier_on() which means it is likely
'struct channel *pch = chan->ppp;' where chan is null for some reason.
there could be an ordering issue here.  pvcc->chan might not be
assigned by the time the event is ready to fire.  it is reasonable to
expect that the carrier status of the hardware device will change
before the vcc is even assigned to the ppp layer.