From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: Re: [1/4] 2.6.23-rc6: known regressions Date: Thu, 13 Sep 2007 07:41:39 -0700 Message-ID: <20070913144139.GD3309@suse.de> References: <20070913093651.GA5077@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-usb-devel-bounces@lists.sourceforge.net Errors-To: linux-usb-devel-bounces@lists.sourceforge.net To: Alan Stern Cc: Oliver Neukum , USB development list , SCSI development list List-Id: linux-scsi@vger.kernel.org On Thu, Sep 13, 2007 at 10:19:48AM -0400, Alan Stern wrote: > On Thu, 13 Sep 2007, Greg KH wrote: > > > Ok, after conferring with Oliver this morning, I think the best solution > > here is to both revert the usb-storage suspend patch as it has some > > basic problems that can cause data loss, _and_ add the change to the > > kernel that by default disables autosuspend on all USB devices except > > hubs. > > Are you referring to the disk spin-down issue? As far as I know, > that's the only troublesome aspect of usb-storage autosuspend (apart > from the fact that so many devices don't seem to support it very well, > if at all). > > Solving the spin-down problem will require coordination with the SCSI > developers. Basically, the SCSI core has to notify the HBA driver > whenever the bus has been idle sufficiently long and all its devices > are ready to be suspended. In particular, all disk heads should be > parked and drives spun down, if they need to be. I am not sure. I will defer to Oliver for the knowledge of the details, it was early in the morning and I can't remember them all exactly :) (although it might be a few days for him to respond, he's here at a conference without a laptop, so his lag time might be a bit longer than normal...) thanks, greg k-h ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel