Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller

[David Miller]

From: Måns Rullgård <mans@xxxxxxxxx>
Date: Wed, 11 Nov 2015 18:25:05 +0000

> If the TX DMA channel is idle when start_xmit is called, it can be
> started immediately.  Checking the DMA status and starting it if
> idle has to be done atomically somehow.

->ndo_start_xmit() is guaranteed to be invoked atomically, protected
by the TX queue spinlock.
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