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    SubjectRe: swsusp regression [Was: 2.6.18-rc3-mm2]
    Date
    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 kernel
    > > > > > >>>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-resume.patch
    > > > > > >>
    > > > > > >>That should only affect resume, not suspend, but it does mess around
    > > > > > >>with ide power management. Is this maybe happening on the *second*
    > > > > > >>suspend?
    > > > > > >>
    > > > > > >>>-hdc: ATAPI 63X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache, UDMA(33)
    > > > > > >>>+hdc: ATAPI CD-ROM drive, 0kB Cache, UDMA(33)
    > > > > > >>This looks suspicious. -mm does have several ide-fix-hpt3xx patches.
    > > > > > >
    > > > > > >I found that git-block.patch broke the suspend for me. Still have 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 completion.
    > > >
    > > > 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 (must_wait
    > > > is "true", because action == ide_wait). Previously &wait was stored 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
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