From: Måns Rullgård <m...@mansr.com> Date: Wed, 11 Nov 2015 19:09:19 +0000
> David Miller <da...@davemloft.net> writes: > >> From: Måns Rullgård <m...@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. Then you can probably use the TXQ lock in the interrupt handler just for that. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
