[PATCH 1/2] drm/tegra: don't take dev->struct_mutex in mmap offset ioctl

[Thierry Reding]

On Wed, Jul 15, 2015 at 03:38:51PM +0200, Daniel Vetter wrote:
> Since David Herrmann's mmap vma manager rework we don't need to grab
> dev->struct_mutex any more to prevent races when looking up the mmap
> offset. Drop it and instead don't forget to use the unref_unlocked
> variant (since the drm core still cares).
> 
> While at it also fix a leak when this ioctl is called on an imported
> buffer.

I don't see where the leak's fixed, but other than that this looks good
to me. Shall I pick this up into the drm/tegra tree?

Thierry

> Cc: Thierry Reding <thierry.reding at gmail.com>
> Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
> ---
>  drivers/gpu/drm/tegra/gem.c | 5 -----
>  1 file changed, 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
> index 01e16e146bfe..827838e64d6e 100644
> --- a/drivers/gpu/drm/tegra/gem.c
> +++ b/drivers/gpu/drm/tegra/gem.c
> @@ -408,12 +408,9 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
>  	struct drm_gem_object *gem;
>  	struct tegra_bo *bo;
>  
> -	mutex_lock(&drm->struct_mutex);
> -
>  	gem = drm_gem_object_lookup(drm, file, handle);
>  	if (!gem) {
>  		dev_err(drm->dev, "failed to lookup GEM object\n");
> -		mutex_unlock(&drm->struct_mutex);
>  		return -EINVAL;
>  	}
>  
> @@ -423,8 +420,6 @@ int tegra_bo_dumb_map_offset(struct drm_file *file, struct drm_device *drm,
>  
>  	drm_gem_object_unreference(gem);
>  
> -	mutex_unlock(&drm->struct_mutex);
> -
>  	return 0;
>  }
>  
> -- 
> 2.1.4
> 
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