[Intel-gfx] [PATCH] drm/i915: Unwind i915_gem_init() failure

[Chris Wilson]

Quoting Chris Wilson (2017-12-07 23:56:25)
> Since Michal introduced new errors other than -EIO during
> i915_gem_init(), we need to actually unwind on the error path as we have
> to abort the module load (and we expect to do so cleanly!).
> 
> As we now teardown key state and then mark the driver as wedged (on
> EIO), we have to be careful to not allow ourselves to resume and
> unwedge, thus attempting to use the uninitialised driver.

Hmm, I don't think this is sufficient just yet, e.g. execbuf should now
report -EINVAL for the absent engine as opposed to -EIO we expect.
Context allocation will still hit uninitialised idr etc.

Back to the plan of having if (ret != -EIO) at each point, I guess.
-Chris