Messages in this thread |  | | | Subject | Re: [PATCH] PCI: Add pci shutdown ability | | From | Lee Revell <> | | Date | Tue, 26 Apr 2005 13:19:48 -0400 |
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On Tue, 2005-04-26 at 13:12 -0400, Alan Stern wrote: > 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.
Ditto sound cards. Once you start capture or playback the device will DMA to/from the assigned area forever.
Lee
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