linux-kernel - Re: [PATCH 6/6] drm: Add four ioctls for managing drm mode object leases [v4]

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Date:   Tue, 10 Oct 2017 09:56:53 -0700
From:   "Keith Packard" <keithp@...thp.com>
To:     Dave Airlie <airlied@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Dave Airlie <airlied@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 6/6] drm: Add four ioctls for managing drm mode object leases [v4]

Dave Airlie <airlied@...il.com> writes:

>> +                */
>> +               ret = idr_alloc(&leases, &drm_lease_idr_object , object_id, object_id + 1, GFP_KERNEL);
>
> In current kernels, the idr_alloc warns if start < 0, so if object_id
> is a negative signed integer, which your
> igt tests actually make it.
>
> So we get an ugly debug splat from the idr code, you should probably
> make sure object_id is
> something valid in signed space first, to avoid the splat.

Yeah, makes sense. I also found the vboxvideo driver in staging which
needed an API tweak.

I've pushed that as drm-lease-v5 and will plan on dumping that to the
list when you're done with -v4.

There are a couple of conflicts and another update needed when merging
leases and the new vblank ioctls together; once we've got one of the two
ready to go, I can rebase the other on top of that and fix things up.

-- 
-keith

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