Difference between qdisc and qdisc_sleeping, netdev_queue

[Henrique Rodrigues]

What is the difference between qdisc and qdisc_sleeping? (in struct
netdev_queue, file include/linux/netdevice.h)

I've been trying to find the answer to this question for a while, but I
didn't succeed.
Does anyone knows why we need both pointers in netdev_queue?

In addition, there are 2 different locks related to these 2 ptrs in
include/net/sch_generic.h: qdisc_root_lock() and qdisc_root_sleeping_lock().
Why we need both?

Thanks,

-- 
Henrique Rodrigues
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