From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benjamin Herrenschmidt Subject: Re: [PATCH 1/3] PM: Introduce new top level suspend and hibernation callbacks (rev. 8) Date: Mon, 14 Apr 2008 10:43:10 +1000 Message-ID: <1208133790.6958.89.camel@pasglop> References: <1208130513.6958.72.camel@pasglop> <200804140207.19340.rjw@sisk.pl> Reply-To: benh@kernel.crashing.org Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from gate.crashing.org ([63.228.1.57]:33446 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752964AbYDNAop (ORCPT ); Sun, 13 Apr 2008 20:44:45 -0400 In-Reply-To: <200804140207.19340.rjw@sisk.pl> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Rafael J. Wysocki" Cc: Alan Stern , Nigel Cunningham , Greg KH , pm list , ACPI Devel Maling List , Len Brown , LKML , Alexey Starikovskiy , David Brownell , Pavel Machek , Oliver Neukum , Jesse Barnes , Andrew Morton > Please have a look at this thread: > http://lkml.org/lkml/2008/3/21/322 > (in short, the reporter sees APM suspend breakage under stress, occuring > because APM uses our suspending of devices without the freezer). Note that the above seems to lack any useful information (as usual) such as what block driver is involved etc... We fixed IDE to be robust vs. pending IOs a while ago. It's possible that libata isn't as solid yet, I don't know. This needs to be done regardless of feezer vs. not freezer. There are thins in the kernel that can trigger BIOs at any time pretty much regardless of user space being frozen or not, again, it's a case of sticking our head in the sand and hoping the freezer hides all our design bugs. Ben.