[Intel-gfx] [PATCH v2] drm/i915: Fix i915_dma_map_single positive error code

[Daniel Vetter]

On Tue, Mar 24, 2015 at 04:44:38PM +0000, Michel Thierry wrote:
> i915_dma_map_single relies on dma_mapping_error, which returns positive
> error codes. Found by static checker.
> 
> Introduced by commit 678d96fbb3b5995a2fdff2bca5e1ab4a40b7e968
> ("drm/i915: Track GEN6 page table usage").
> 
> v2: Return negative error code and rename commit title. (Dan)
> 
> Cc: Dan Carpenter <dan.carpenter at oracle.com>
> Cc: Mika Kuoppala <mika.kuoppala at intel.com>

Still missing the reported-by. Giving credit where it's due is important,
especially when they work for other companies than Intel.
-Daniel

> Signed-off-by: Michel Thierry <michel.thierry at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_gem_gtt.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
> index 645c363..6bb31c8 100644
> --- a/drivers/gpu/drm/i915/i915_gem_gtt.c
> +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
> @@ -311,7 +311,10 @@ static inline int i915_dma_map_page_single(struct page *page,
>  	struct device *device = &dev->pdev->dev;
>  
>  	*daddr = dma_map_page(device, page, 0, 4096, PCI_DMA_BIDIRECTIONAL);
> -	return dma_mapping_error(device, *daddr);
> +	if (dma_mapping_error(device, *daddr))
> +		return -ENOMEM;
> +
> +	return 0;
>  }
>  
>  static void unmap_and_free_pt(struct i915_page_table_entry *pt,
> -- 
> 2.1.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch