[Intel-gfx] Recent changes

[Konstantin Belousov]

I have two questions about recent changes made to the kernel driver:

1. Looking at the intel_setup_overlay() after the commit
ecbec53b1d00ba582f71b210ed96cafc05ebd189, it seems there is potential
double unlock for the struct_mutex in the (unlikely) case when
intel_overlay_map_regs() failed.

2. In i915_wait_request(), after the commit
4697995b98417c6da9ab2708a36f5e2bc926c8ac, shouldn't the calls
	i915_driver_irq_preinstall(ring->dev);
	i915_driver_irq_postinstall(ring->dev);
be replaced with
	ring->dev->driver->irq_preinstall(ring->dev);
	ring->dev->driver->irq_postinstall(ring->dev);
?
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