Re: [PATCH] PCI: Add pci shutdown ability

Alan Stern
2005-04-26T17:12:43Z

On Tue, 26 Apr 2005, Grant Grundler wrote:

> On Tue, Apr 26, 2005 at 12:07:41PM -0400, Richard B. Johnson wrote:
> > DMAs don't go on "forever"
>
> They don't. But we also don't know when they will stop.
> E.g. NICs will stop DMA when the RX descriptor ring is full.
> I don't know when USB stop on it's own.

USB doesn't stop DMA on its own. It goes on forever until it's told to
stop or it encounters an error.

Alan Stern