Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758046AbZDOCmj (ORCPT ); Tue, 14 Apr 2009 22:42:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753133AbZDOCm3 (ORCPT ); Tue, 14 Apr 2009 22:42:29 -0400 Received: from casper.infradead.org ([85.118.1.10]:60143 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752120AbZDOCm2 (ORCPT ); Tue, 14 Apr 2009 22:42:28 -0400 Date: Tue, 14 Apr 2009 19:44:14 -0700 From: Arjan van de Ven To: Jeff Garzik Cc: Linux USB kernel mailing list , Greg KH , Alan Stern , LKML , "Rafael J. Wysocki" Subject: Re: USB storage no-boot regression (bisected) Message-ID: <20090414194414.22c63728@infradead.org> In-Reply-To: <49E546C4.1060001@garzik.org> References: <49E4FAC6.1030400@garzik.org> <20090414183807.3baf72ed@infradead.org> <49E546C4.1060001@garzik.org> Organization: Intel X-Mailer: Claws Mail 3.7.0 (GTK+ 2.14.7; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1304 Lines: 37 On Tue, 14 Apr 2009 22:30:28 -0400 Jeff Garzik wrote: > Arjan van de Ven wrote: > > This change just made it go faster enough for you to be out of luck; > > fundamentally your userland needs to wait if the device it wants is > > not there. > > All these drivers are in-kernel, and the root device is passed via > command line. There is no userland at that point, that needs to wait. ok fair; but that does not change that the kernel does not know if a device is coming. Yes that sucks; sadly USB is just this way, you don't know when no new devices will come from a certain bus. > > If this change added an implicit initramfs requirement, that is a > pretty major regression. it didn't; this is what root_wait is for. Having said that, I have a patch that basically retries this stuff inside the kernel if the mount-of-rootfs fails.... (but it's independent of the usb improvement) -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for power savings, visit http://www.lesswatts.org -- 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/