[Intel-gfx] [PATCH 3/3] drm/i915: Use rcu_dereference for rcu protected pointer

[Chris Wilson]

Quoting Niranjana Vishwanathapura (2019-11-06 00:02:05)
> 'ctx\->vm' is rcu protected, so use rcu_dereference inside
> read side critical section. It fixes a sparse warning.
> 
> Cc: Chris P Wilson <chris.p.wilson at intel.com>
> Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
> ---
>  drivers/gpu/drm/i915/gem/i915_gem_context.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> index de6e55af82cf..d3a622f60fd9 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> @@ -1002,12 +1002,13 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv,
>         struct i915_address_space *vm;
>         int ret;
>  
> -       if (!rcu_access_pointer(ctx->vm))
> -               return -ENODEV;

This is correctly serialised by the caller.
-Chris
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