From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Subject: Re: [PATCH] drm/i915: Fix unsafe loop iteration over vma whilst unbinding them Date: Fri, 21 Mar 2014 16:12:39 +0100 Message-ID: <20140321151239.GD30571@phenom.ffwll.local> References: <1395387656-12212-1-git-send-email-chris@chris-wilson.co.uk> <20140321075158.GC5419@nuc-i3427.alporthouse.com> <20140321095723.GY30571@phenom.ffwll.local> <874n2rq03n.fsf@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-ee0-f51.google.com (mail-ee0-f51.google.com [74.125.83.51]) by gabe.freedesktop.org (Postfix) with ESMTP id 0BE076E371 for ; Fri, 21 Mar 2014 08:12:43 -0700 (PDT) Received: by mail-ee0-f51.google.com with SMTP id c13so1917955eek.38 for ; Fri, 21 Mar 2014 08:12:43 -0700 (PDT) Content-Disposition: inline In-Reply-To: <874n2rq03n.fsf@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Jani Nikula Cc: intel-gfx@lists.freedesktop.org, Ben Widawsky List-Id: intel-gfx@lists.freedesktop.org On Fri, Mar 21, 2014 at 01:09:48PM +0200, Jani Nikula wrote: > On Fri, 21 Mar 2014, Daniel Vetter wrote: > > On Fri, Mar 21, 2014 at 07:51:58AM +0000, Chris Wilson wrote: > >> On Fri, Mar 21, 2014 at 07:40:56AM +0000, Chris Wilson wrote: > >> > On non-LLC platforms, when changing the cache level of an object, we may > >> > need to unbind it show that prefetching across page boundaries does not > >> s/show/so/ > >> > cross into a different memory domain. This requires us to unbind > >> > conflicting vma, but we did so was iterating over the objects vma in an > >> s/was// > >> > unsafe manner (as the list was being modified as we iterated). > >> > >> Coffee will kick in in about 5 minutes. > > > > Fixed and applied, thanks for the patch. > > Given the regression was introduced in v3.12 I thought this would've > been fixes & cc: stable. Oops, thanks for catching this. cc: stable added. My Linus weather forcast tells me that -fixes is closed for 3.14 already, so dinq is good enough. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch