On 04/10/2018 10:16 AM, David Miller wrote:
> The tradeoff here is that now you are doing two unnecessary atomic
> operations per stats dump.
> That is what the RCU lock allows us to avoid.

dev_hold() and dev_put() are actually per cpu increment and decrements,
pretty cheap these days.

Problem here is that any preemption of the process holding device reference
might trigger warnings in device unregister.

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