[RFC PATCH] drm/i915: Tolerate file owned GEM contexts on hot unbind

[Janusz Krzysztofik]

On Friday, May 17, 2019 4:32:35 PM CEST Chris Wilson wrote:
> Quoting Janusz Krzysztofik (2019-05-17 15:06:17)
> > From: Janusz Krzysztofik <janusz.krzysztofik at intel.com>
> > 
> > During i915_driver_unload(), GEM contexts are verified restrictively
> > inside i915_gem_fini() if they don't consume shared resources which
> > should be cleaned up before the driver is released.  If those checks
> > don't result in kernel panic, one more check is performed at the end of
> > i915_gem_fini() which issues a WARN_ON() if GEM contexts still exist.
> 
> Just fix the underlying bug of this code being called too early. The
> assumptions we made for unload are clearly invalid when applied to
> unbind, and we need to split the phases.
> -Chris

Thanks Chris, I think I get it finally.

Janusz