Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261666AbVDZRMn (ORCPT ); Tue, 26 Apr 2005 13:12:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261680AbVDZRMm (ORCPT ); Tue, 26 Apr 2005 13:12:42 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:17280 "HELO iolanthe.rowland.org") by vger.kernel.org with SMTP id S261666AbVDZRMd (ORCPT ); Tue, 26 Apr 2005 13:12:33 -0400 Date: Tue, 26 Apr 2005 13:12:31 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Grant Grundler cc: "Richard B. Johnson" , Alexander Nyberg , Greg KH , Amit Gud , , , , , , USB development list Subject: Re: [PATCH] PCI: Add pci shutdown ability In-Reply-To: <20050426161907.GD2612@colo.lackof.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 673 Lines: 19 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/