From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: ata_ram driver Date: Fri, 07 Mar 2008 09:13:06 +0900 Message-ID: <47D08892.3080209@gmail.com> References: <20080222200951.GI16995@parisc-linux.org> <47BF3E54.9050609@rtr.ca> <47CFA9A6.2040506@gmail.com> <1204817301.3062.3.camel@localhost.localdomain> <47D08478.8010700@gmail.com> <1204848119.3062.94.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from wa-out-1112.google.com ([209.85.146.182]:53692 "EHLO wa-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751690AbYCGANP (ORCPT ); Thu, 6 Mar 2008 19:13:15 -0500 Received: by wa-out-1112.google.com with SMTP id v27so174294wah.23 for ; Thu, 06 Mar 2008 16:13:13 -0800 (PST) In-Reply-To: <1204848119.3062.94.camel@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: James Bottomley Cc: Mark Lord , Matthew Wilcox , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, Jeff Garzik James Bottomley wrote: >> * Driver unload: Dealt the same way as hot unplugging. > > This is the problem case: driver unloading should have a > scsi_remove_host() in its path. This is the trigger that sends out the > flushes/stops and calls slave_destroy. scsi_remove_host() doesn't > actually return until all the destroys are completed, so it makes module > unloading wait until everything is properly shut down. > >> Making driver unload like explicit unplug request is possible but it >> will mean that drives will be spun down on driver unload, which can be >> annoying to developers. > > You have a sysfs flag to prevent that, don't you? Yeap, sure. It's the combination of things that always made me put this off. Is there a function I can call to just shutdown the host instead of destroying it? Thanks. -- tejun