Re: [PATCH v5] net: ethernet: add driver for Aurora VLSI NB8800 Ethernet controller
From: David Miller
Date: Wed Nov 11 2015 - 14:13:17 EST
From: Måns Rullgård <mans@xxxxxxxxx>
Date: Wed, 11 Nov 2015 19:09:19 +0000
> David Miller <davem@xxxxxxxxxxxxx> writes:
>> 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.
> 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
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/