Messages in this thread | | | From | Måns Rullgård <> | Subject | Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller | Date | Wed, 11 Nov 2015 19:09:19 +0000 |
| |
David Miller <davem@davemloft.net> writes:
> From: Måns Rullgård <mans@mansr.com> > 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.
Yes, but the DMA needs to be restarted from some other context if it was busy when start_xmit checked.
-- Måns Rullgård mans@mansr.com
| |