Re: [PATCH] drm/gem: Document that handle_create must be the last step

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On 03/22/2018 10:02 AM, Daniel Vetter wrote:
It published
s/It/If
  the gem object to userspace, by that point other threads
can guess the id and start using it. And gem IDs are _very_ easy to
guess (it's just an idr).

Since gem objects is the only thing we allow drivers to create
themselves (all the kms/prime/syncobj stuff is handled by the core) no
other functions seem to be in need of this clarification.

Motivated by reviewing the xen-front kms driver.

Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
  drivers/gpu/drm/drm_gem.c | 9 ++++++---
  1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 4975ba9a7bc8..4a16d7b26c89 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -436,9 +436,12 @@ drm_gem_handle_create_tail(struct drm_file *file_priv,
   * @obj: object to register
   * @handlep: pionter to return the created handle to the caller
   *
- * Create a handle for this object. This adds a handle reference
- * to the object, which includes a regular reference count. Callers
- * will likely want to dereference the object afterwards.
+ * Create a handle for this object. This adds a handle reference to the object,
+ * which includes a regular reference count. Callers will likely want to
+ * dereference the object afterwards.
+ *
+ * Since this publishes @obj to userspace it must be fully set up by this point,
+ * drivers must call this last in their buffer object creation callbacks.
   */
  int drm_gem_handle_create(struct drm_file *file_priv,
  			  struct drm_gem_object *obj,

Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>

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