Accessing pointers inside struct passed as argument to ioctl calls

[Valdis.Kletnieks at vt.edu]

On Mon, 28 Sep 2015 19:59:41 -0300, "Daniel." said:

> The real thing is a driver to nrf24l01+ driver from Nordic. I may use this
> non copying aproach to exchange lot of frames without copying. This would
> improve driver's performance. :)

There is already well-developed zero-copy code for several network drivers
in the kernel tree.  Don't re-invent existing code that's already debugged.
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