drm/i915/dmabuf: Tighten struct_mutex for unmap_dma_buf
We only need the struct_mutex to manipulate the pages_pin_count on the object, we do not need to hold our BKL when freeing the exported scatterlist. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1460113874-17366-2-git-send-email-chris@chris-wilson.co.uk
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@ -95,14 +95,12 @@ static void i915_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
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{
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struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
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mutex_lock(&obj->base.dev->struct_mutex);
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dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
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sg_free_table(sg);
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kfree(sg);
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mutex_lock(&obj->base.dev->struct_mutex);
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i915_gem_object_unpin_pages(obj);
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mutex_unlock(&obj->base.dev->struct_mutex);
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}
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