Re: [PATCH] Prevent netpoll hanging when link is down

[Andi Kleen <ak@xxxxxxx>]

> Deadlocks from recursion, presumably? We could probably throw in a max
> retry count, as ugly as that is..

There should not be any recursion, no.

The problem is that the poll is effectively a spinlock. But when
another CPU takes an long interrupt while holding the lock it 
could take quite a long time to grab the lock.

For most network drivers this shouldn't occur though because
the net driver private lock is usually always taken with interrupts
off. 


-Andi