[PATCH 2/4] drm/etnaviv: move MMU context ref/unref into map/unmap_gem

[Lucas Stach]

This makes it a little more clear that the mapping holds a reference
to the context once the buffer has been successfully mapped into that
context and simplifies the error handling a bit.

Signed-off-by: Lucas Stach <l.st...@pengutronix.de>
---
 drivers/gpu/drm/etnaviv/etnaviv_gem.c | 11 +++--------
 drivers/gpu/drm/etnaviv/etnaviv_mmu.c |  3 +++
 2 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c 
b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index d5314aa28ff7..a68e6a17505e 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -294,18 +294,15 @@ struct etnaviv_vram_mapping *etnaviv_gem_mapping_get(
                list_del(&mapping->obj_node);
        }
 
-       mapping->context = etnaviv_iommu_context_get(mmu_context);
        mapping->use = 1;
 
        ret = etnaviv_iommu_map_gem(mmu_context, etnaviv_obj,
                                    mmu_context->global->memory_base,
                                    mapping, va);
-       if (ret < 0) {
-               etnaviv_iommu_context_put(mmu_context);
+       if (ret < 0)
                kfree(mapping);
-       } else {
+       else
                list_add_tail(&mapping->obj_node, &etnaviv_obj->vram_list);
-       }
 
 out:
        mutex_unlock(&etnaviv_obj->lock);
@@ -498,10 +495,8 @@ void etnaviv_gem_free_object(struct drm_gem_object *obj)
 
                WARN_ON(mapping->use);
 
-               if (context) {
+               if (context)
                        etnaviv_iommu_unmap_gem(context, mapping);
-                       etnaviv_iommu_context_put(context);
-               }
 
                list_del(&mapping->obj_node);
                kfree(mapping);
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c 
b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
index aabb997a74eb..3957b9a752f5 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_mmu.c
@@ -245,6 +245,7 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu_context 
*context,
                iova = sg_dma_address(sgt->sgl) - memory_base;
                if (iova < 0x80000000 - sg_dma_len(sgt->sgl)) {
                        mapping->iova = iova;
+                       mapping->context = etnaviv_iommu_context_get(context);
                        list_add_tail(&mapping->mmu_node, &context->mappings);
                        ret = 0;
                        goto unlock;
@@ -271,6 +272,7 @@ int etnaviv_iommu_map_gem(struct etnaviv_iommu_context 
*context,
                goto unlock;
        }
 
+       mapping->context = etnaviv_iommu_context_get(context);
        list_add_tail(&mapping->mmu_node, &context->mappings);
        context->flush_seq++;
 unlock:
@@ -299,6 +301,7 @@ void etnaviv_iommu_unmap_gem(struct etnaviv_iommu_context 
*context,
        list_del(&mapping->mmu_node);
        context->flush_seq++;
        mutex_unlock(&context->lock);
+       etnaviv_iommu_context_put(context);
 }
 
 static void etnaviv_iommu_context_free(struct kref *kref)
-- 
2.30.2