From: Cong Wang <[email protected]>
Date: Thu, 1 Oct 2015 11:37:42 -0700
> After commit 1ce87720d456 ("net: sched: make cls_u32 lockless")
> we began to release tc actions in a RCU callback. However,
> mirred action relies on RTNL lock to protect the global
> mirred_list, therefore we could have a race condition
> between RCU callback and netdevice event, which caused
> a list corruption as reported by Vinson.
>
> Instead of relying on RTNL lock, introduce a spinlock to
> protect this list.
>
> Note, in non-bind case, it is still called with RTNL lock,
> therefore should disable BH too.
>
> Reported-by: Vinson Lee <[email protected]>
> Cc: John Fastabend <[email protected]>
> Cc: Jamal Hadi Salim <[email protected]>
> Signed-off-by: Cong Wang <[email protected]>
> Signed-off-by: Cong Wang <[email protected]>
Applied.
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