linux-kernel - Re: [PATCH 4/5] drm/i915: Fixup global gtt cleanup

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Date:	Fri, 06 Jun 2014 16:22:16 +0300
From:	Imre Deak <imre.deak@...el.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>
Cc:	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 4/5] drm/i915: Fixup global gtt cleanup

On Thu, 2014-06-05 at 16:58 +0200, Daniel Vetter wrote:
> The global gtt is setup up in 2 parts, so we need to be careful
> with the cleanup. For consistency shovel it all into the ->cleanup
> callback, like with ppgtt.
> 
> Noticed because it blew up in the out_gtt: cleanup code while
> fiddling with the vgacon code.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>

Reviewed-by: Imre Deak <imre.deak@...el.com>

> ---
>  drivers/gpu/drm/i915/i915_dma.c     | 4 ----
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 9 ++++++++-
>  2 files changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> index b9159ade5e85..27fe65ac5940 100644
> --- a/drivers/gpu/drm/i915/i915_dma.c
> +++ b/drivers/gpu/drm/i915/i915_dma.c
> @@ -1386,7 +1386,6 @@ cleanup_gem:
>  	i915_gem_context_fini(dev);
>  	mutex_unlock(&dev->struct_mutex);
>  	WARN_ON(dev_priv->mm.aliasing_ppgtt);
> -	drm_mm_takedown(&dev_priv->gtt.base.mm);
>  cleanup_irq:
>  	drm_irq_uninstall(dev);
>  cleanup_gem_stolen:
> @@ -1756,8 +1755,6 @@ out_mtrrfree:
>  	arch_phys_wc_del(dev_priv->gtt.mtrr);
>  	io_mapping_free(dev_priv->gtt.mappable);
>  out_gtt:
> -	list_del(&dev_priv->gtt.base.global_link);
> -	drm_mm_takedown(&dev_priv->gtt.base.mm);
>  	dev_priv->gtt.base.cleanup(&dev_priv->gtt.base);
>  out_regs:
>  	intel_uncore_fini(dev);
> @@ -1846,7 +1843,6 @@ int i915_driver_unload(struct drm_device *dev)
>  			i915_free_hws(dev);
>  	}
>  
> -	list_del(&dev_priv->gtt.base.global_link);
>  	WARN_ON(!list_empty(&dev_priv->vm_list));
>  
>  	drm_vblank_cleanup(dev);
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 931b906f292a..41e864ec5632 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -1985,7 +1985,10 @@ static void gen6_gmch_remove(struct i915_address_space *vm)
>  
>  	struct i915_gtt *gtt = container_of(vm, struct i915_gtt, base);
>  
> -	drm_mm_takedown(&vm->mm);
> +	if (drm_mm_initialized(&vm->mm)) {
> +		drm_mm_takedown(&vm->mm);
> +		list_del(&vm->global_link);
> +	}
>  	iounmap(gtt->gsm);
>  	teardown_scratch_page(vm->dev);
>  }
> @@ -2018,6 +2021,10 @@ static int i915_gmch_probe(struct drm_device *dev,
>  
>  static void i915_gmch_remove(struct i915_address_space *vm)
>  {
> +	if (drm_mm_initialized(&vm->mm)) {
> +		drm_mm_takedown(&vm->mm);
> +		list_del(&vm->global_link);
> +	}
>  	intel_gmch_remove();
>  }
>  


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