From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Neukum Subject: Re: Should suspend plug low-level devices? Date: Thu, 17 Mar 2016 09:20:35 +0100 Message-ID: <1458202835.4312.3.camel@suse.com> References: <20160316150053.GG6980@mtj.duckdns.org> <20160316163554.GK6980@mtj.duckdns.org> <1458201028.4312.0.camel@suse.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Return-path: Received: from mx2.suse.de ([195.135.220.15]:59061 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755499AbcCQIX1 (ORCPT ); Thu, 17 Mar 2016 04:23:27 -0400 In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Jiri Kosina Cc: Peter Chen , "Rafael J. Wysocki" , Tejun Heo , Florian Mickler , Alan Stern , Jan Kara , Linux-pm mailing list On Thu, 2016-03-17 at 09:02 +0100, Jiri Kosina wrote: > On Thu, 17 Mar 2016, Oliver Neukum wrote: > > > But what about character devices? > > What makes the special in this context? Actually nothing, but they don't dpend on file systems. So I see a basic problem, how does a device driver know which kernel threads cause IO? Are you assuming that only those a driver starts itself are important? Regards Oliver