[Intel-gfx] [PATCH 04/10] drm/i915: drop polled waits from i915_wait_request

Chris Wilson chris at chris-wilson.co.uk
Sat Apr 21 11:29:35 CEST 2012

On Fri, 20 Apr 2012 18:23:26 -0700, Ben Widawsky <ben at bwidawsk.net> wrote:
> The only time irq_get should fail is during unload or suspend. Both of
> these points should try to quiesce the GPU before disabling interrupts
> and so the atomic polling should never occur.
> This was recommended by Chris Wilson as a way of reducing added
> complexity to the polled wait which I introduced in an RFC patch.
> 09:57 < ickle_> it's only there as a fudge for waiting after irqs
> after uninstalled during s&r, we aren't actually meant to hit it
> 09:57 < ickle_> so maybe we should just kill the code there and fix the breakage
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Signed-off-by: Ben Widawsky <benjamin.widawsky at intel.com>
> ---

> +		if (WARN_ON(!ring->irq_get(ring)))
> +			return -EBUSY;

I think this is now a -ENODEV; :)

Chris Wilson, Intel Open Source Technology Centre

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