On Sun, Aug 17, 2014 at 11:01 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000020
> IP: ieee80211_vif_use_reserved_switch+0x71c/0xb00 [mac80211]
Looking at the Code: line and the code generation for that function,
this *looks* to be this code:
list_del(&sdata->reserved_chanctx_list);
list_move(&sdata->assigned_chanctx_list,
&new_ctx->assigned_vifs);
sdata->reserved_chanctx = NULL;
in ieee80211_vif_use_reserved_switch(), where "new_ctx" is NULL, so
the "list_move()" ends up oopsing. But maybe I screwed up the
analysis, I don't know the code.
Looks like that is all-new code introduced by commit 5bcae31d9cb1
("mac80211: implement multi-vif in-place reservations")
And doesn't look at all IWL-specific. Adding Michal Kazior to the list
of people.
Linus
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