On Fri, Aug 09, 2013 at 10:12:15PM -0700, Ben Widawsky wrote:
> The conditional is usually a recoverable driver bug, and so WARNing, and
> preventing the drm_mm code from doing potential damage (BUG) is
> desirable.
>
> This issue was hit and fixed twice while developing the i915 multiple
> address space code. The first fix is the patch just before this, and is
> hit on an not frequently occuring error path. Another was fixed during
> patch iteration, so it's hard to see from the patch:
>
> commit c6cfb325677ea6305fb19acf3a4d14ea267f923e
> Author: Ben Widawsky <ben@xxxxxxxxxxxx>
> Date: Fri Jul 5 14:41:06 2013 -0700
>
> drm/i915: Embed drm_mm_node in i915 gem obj
>
> From the intel-gfx mailing list, we discussed this:
> References: <20130705191235.GA3057@xxxxxxxxxxxx>
>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> CC: <dri-devel@xxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ben Widawsky <ben@xxxxxxxxxxxx>
On the other hand, if we end up with a proliferation of
if (drm_mm_node_allocated(node))
drm_mm_remove_node(node)
in the drivers, putting the guard into remove_node is preferrable. At
the moment we only have the one error path in i915.ko where we need to
double check so it is not much of a concern.
Acked-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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