Re: [PATCH] drm/cma-helper: Fix drm_gem_cma_free_object()

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On 5/7/19 7:04 PM, Noralf Trønnes wrote:
Hi,

Could someone please have a look at this one?

Noralf.

Den 26.04.2019 14.47, skrev Noralf Trønnes:
The logic for freeing an imported buffer with a virtual address is
broken. It will free the buffer instead of unmapping the dma buf.
Fix by reversing the if ladder and first check if the buffer is imported.

Fixes: b9068cde51ee ("drm/cma-helper: Add DRM_GEM_CMA_VMAP_DRIVER_OPS")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: "Li, Tingqian" <tingqian.li@xxxxxxxxx>
Signed-off-by: Noralf Trønnes <noralf@xxxxxxxxxxx>
Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
---

  drivers/gpu/drm/drm_gem_cma_helper.c | 8 ++++----
  1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index cc26625b4b33..e01ceed09e67 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -186,13 +186,13 @@ void drm_gem_cma_free_object(struct drm_gem_object *gem_obj)
cma_obj = to_drm_gem_cma_obj(gem_obj); - if (cma_obj->vaddr) {
-		dma_free_wc(gem_obj->dev->dev, cma_obj->base.size,
-			    cma_obj->vaddr, cma_obj->paddr);
-	} else if (gem_obj->import_attach) {
+	if (gem_obj->import_attach) {
  		if (cma_obj->vaddr)
  			dma_buf_vunmap(gem_obj->import_attach->dmabuf, cma_obj->vaddr);
  		drm_prime_gem_destroy(gem_obj, cma_obj->sgt);
+	} else if (cma_obj->vaddr) {
+		dma_free_wc(gem_obj->dev->dev, cma_obj->base.size,
+			    cma_obj->vaddr, cma_obj->paddr);
  	}
drm_gem_object_release(gem_obj);

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