[Intel-gfx] [PATCH] drm/i915: Return -EPERM when i915_gem_mmap_ioctl handling prime objects

[Daniel Vetter]

On Tue, Aug 15, 2017 at 10:42 AM, Tina Zhang <tina.zhang at intel.com> wrote:
> Prime objects have no backing filp to GEM mmap pages from. So, for Prime
> objects, such operation is not permitted.

EPERM is when you don't have enough permissions, but it's possible
(e.g. a feature requiring root, or drm master). -EINVAL is if
something is invalid, and not even root can change that. So from a
consistency pov, EINVAL is the right error code here I think.
-Daniel

>
> v1:
> - Separate this patch from dma-buf patch set. (Joonas)
>
> Signed-off-by: Tina Zhang <tina.zhang at intel.com>
> Cc: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
>
> diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
> index 0628fb1..bb9d5ed 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -1704,7 +1704,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
>          */
>         if (!obj->base.filp) {
>                 i915_gem_object_put(obj);
> -               return -EINVAL;
> +               return -EPERM;
>         }
>
>         addr = vm_mmap(obj->base.filp, 0, args->size,
> --
> 2.7.4
>
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch