[Bug 76671] [PNV/ILK Regression]X will be no response when run all piglit cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76671

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #5 from lu hua <huax.lu at intel.com> ---
(In reply to comment #4)
> I think:
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c
> b/drivers/gpu/drm/i915/i915_gem_context.c
> index 021e21223c9c..91000ff1b626 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -506,9 +506,6 @@ int i915_gem_context_enable(struct drm_i915_private
> *dev_priv)
>  	struct intel_ring_buffer *ring;
>  	int ret, i;
>  
> -	if (!HAS_HW_CONTEXTS(dev_priv->dev))
> -		return 0;
> -
>  	/* This is the only place the aliasing PPGTT gets enabled, which means
>  	 * it has to happen before we bail on reset */
>  	if (dev_priv->mm.aliasing_ppgtt) {
> @@ -833,7 +830,13 @@ int i915_switch_context(struct intel_ring_buffer *ring,
>  
>  	/* We have the fake context */
>  	if (!HAS_HW_CONTEXTS(ring->dev)) {
> -		ring->last_context = to;
> +		if (to != ring->last_context) {
> +			if (to)
> +				i915_gem_context_reference(to);
> +			if (ring->last_context)
> +				i915_gem_context_unreference(ring->last_context);
> +			ring->last_context = to;
> +		}
>  		return 0;
>  	}


Test this patch, system boot fail.

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