[PATCH v4 2/2] drm/panfrost: Use drm_gem_map_offset()

[Steven Price]

panfrost_ioctl_mmap_bo() contains a reimplementation of
drm_gem_map_offset() but with a bug - it allows mapping imported
objects (without going through the exporter). Fix this by switching to
use the newly renamed drm_gem_map_offset() function instead which has
the bonus of simplifying the code.

Signed-off-by: Steven Price <steven.pr...@arm.com>
Reviewed-by: Alyssa Rosenzweig <aly...@rosenzweig.io>
---
 drivers/gpu/drm/panfrost/panfrost_drv.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c 
b/drivers/gpu/drm/panfrost/panfrost_drv.c
index e34e86a7378a..1498b9b07a8f 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -259,26 +259,14 @@ static int panfrost_ioctl_mmap_bo(struct drm_device *dev, 
void *data,
                      struct drm_file *file_priv)
 {
        struct drm_panfrost_mmap_bo *args = data;
-       struct drm_gem_object *gem_obj;
-       int ret;
 
        if (args->flags != 0) {
                DRM_INFO("unknown mmap_bo flags: %d\n", args->flags);
                return -EINVAL;
        }
 
-       gem_obj = drm_gem_object_lookup(file_priv, args->handle);
-       if (!gem_obj) {
-               DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);
-               return -ENOENT;
-       }
-
-       ret = drm_gem_create_mmap_offset(gem_obj);
-       if (ret == 0)
-               args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);
-       drm_gem_object_put_unlocked(gem_obj);
-
-       return ret;
+       return drm_gem_map_offset(file_priv, dev, args->handle,
+                                      &args->offset);
 }
 
 static int panfrost_ioctl_get_bo_offset(struct drm_device *dev, void *data,
-- 
2.20.1