From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Rafael J. Wysocki" Subject: Re: swsusp regression [Was: 2.6.18-rc3-mm2] Date: Tue, 8 Aug 2006 13:16:00 +0200 Message-ID: <200608081316.00749.rjw@sisk.pl> References: <20060806030809.2cfb0b1e.akpm@osdl.org> <20060808110447.GM4025@suse.de> <20060808110726.GN4025@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20060808110726.GN4025@suse.de> Content-Disposition: inline List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-pm-bounces@lists.osdl.org Errors-To: linux-pm-bounces@lists.osdl.org To: Jens Axboe Cc: Andrew Morton , linux-pm@osdl.org, Jiri Slaby , andre@linux-ide.org, linux-ide@vger.kernel.org, Jason Lunz , linux-kernel@vger.kernel.org List-Id: linux-ide@vger.kernel.org On Tuesday 08 August 2006 13:07, Jens Axboe wrote: > On Tue, Aug 08 2006, Jens Axboe wrote: > > On Tue, Aug 08 2006, Rafael J. Wysocki wrote: > > > On Tuesday 08 August 2006 12:43, Jens Axboe wrote: > > > > On Tue, Aug 08 2006, Jiri Slaby wrote: > > > > > Rafael J. Wysocki wrote: > > > > > >On Monday 07 August 2006 18:23, Jason Lunz wrote: > > > > > >>In gmane.linux.kernel, you wrote: > > > > > >>>>ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6= /2.6.18-rc3/2.6.18-rc3-mm2/ > > > > > >>>I tried it and guess what :)... swsusp doesn't work :@. > > > > > >>> > > > > > >>>This time I was able to dump process states with sysrq-t: > > > > > >>>http://www.fi.muni.cz/~xslaby/sklad/ide2.gif > > > > > >>> > > > > > >>>My guess is ide2/2.0 dies (hpt370 driver), since last thing ke= rnel = > > > > > >>>prints is suspending device 2.0 > > > > > >>Does it go away if you revert this? > > > > > >>ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2= .6.18-rc3/2.6.18-rc3-mm2/broken-out/ide-reprogram-disk-pio-timings-on-resum= e.patch > > > > > >> > > > > > >>That should only affect resume, not suspend, but it does mess a= round > > > > > >>with ide power management. Is this maybe happening on the *seco= nd* > > > > > >>suspend? > > > > > >> > > > > > >>>-hdc: ATAPI 63X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDM= A(33) > > > > > >>>+hdc: ATAPI CD-ROM drive, 0kB Cache, UDMA(33) > > > > > >>This looks suspicious. -mm does have several ide-fix-hpt3xx pat= ches. > > > > > > > > > > > >I found that git-block.patch broke the suspend for me. Still ha= ve no idea > > > > > >what's up with it. > > > > > = > > > > > I suspect elevator changes. The wait_for_completion is not woken = in > > > > > ide-io by ll_rw_blk. But I don't understand block layer too much. > > > > = > > > > The ide changes are far more likely, it's probably missing a comple= tion. > > > = > > > Actually I think the commit f74bf2e6b415588e562fdcfdd454d587eb33cd46 > > > (Remove ->waiting member from struct request) is wrong, because > > > generic_ide_suspend() uses the end_of_io member of rq to pass the PM = data > > > to ide_do_drive_cmd() where the pointer gets overwritten by &wait (mu= st_wait > > > is "true", because action =3D=3D ide_wait). Previously &wait was sto= red in > > > rq->waiting and it didn't overwrite the PM data. > > = > > Indeed, that looks broken now. That must be what is screwing it up. With > > the former patch applied, did cdrom detection still look funny to you? Hm, I'm not sure what you mean ... > > = > > I'll concoct a fix for that breakage. > = > Something like this. Looks good, I'll give it a try. Rafael