linux-kernel - Re: [Nouveau] noveau: emergency shutdown handling is overcomplex and broken

Open Source and information security mailing list archives

Date:   Tue, 25 Oct 2016 13:13:00 +0200
From:   Pavel Machek <pavel@....cz>
To:     Karol Herbst <karolherbst@...il.com>
Cc:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        ML nouveau <nouveau@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Nouveau] noveau: emergency shutdown handling is overcomplex and
 broken

On Tue 2016-10-25 13:09:25, Karol Herbst wrote:
> Thanks for the pointer.
> 
> But I don't like this patch. If you find a bug, make a bug report or
> just fix it if you know the fix already. Or write something in
> IRC. Or

I found a bug, and this is my bug report. Can you take care and fix
it?

									Pavel

> write on the Mailing list as a general question or something else
> 
> But I really don't agree on doing it this way. You would have needed
> like the same amount of time to actual fix the problem.
> 
> Anyway, for adding a printk:
> 
> struct nvkm_subdev *subdev = &therm->subdev;
> nvkm_error(subdev, "message");
> 
> 2016-10-25 12:50 GMT+02:00 Pavel Machek <pavel@....cz>:
> >
> > diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c
> > index b9703c0..adb1deb 100644
> > --- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c
> > +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c
> > @@ -120,6 +120,11 @@ nvkm_therm_sensor_event(struct nvkm_therm *therm, enum nvkm_therm_thrs thrs,
> >                         struct work_struct *work;
> >
> >                         work = kmalloc(sizeof(*work), GFP_ATOMIC);
> > +                       /* FIXME:
> > +                          1) this is total overkill, orderly_poweroff() already
> > +                          uses schedule_work internally
> > +                          2) it would  be good to at least printk what is going on
> > +                       */
> >                         if (work) {
> >                                 INIT_WORK(work, nv_poweroff_work);
> >                                 schedule_work(work);
> >
> > GFP_ATOMIC is not reliable. Plus, see the fixme.
> >
> > Best regards,
> >                                                                         Pavel
> >
> > --
> > (english) http://www.livejournal.com/~pavelmachek
> > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
> >
> > _______________________________________________
> > Nouveau mailing list
> > Nouveau@...ts.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/nouveau
> >

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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