drm/ttm: kill fence_lock

No users are left, kill it off! :D
Conversion to the reservation api is next on the list, after
that the functionality can be restored with rcu.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>

2 files changed, 1 insertions, 7 deletions

diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index e3d39c80a091..5805f4a49478 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -237,10 +237,7 @@ struct ttm_buffer_object {
         struct list_head io_reserve_lru;
 
         /**
-         * Members protected by struct buffer_object_device::fence_lock
-         * In addition, setting sync_obj to anything else
-         * than NULL requires bo::reserved to be held. This allows for
-         * checking NULL while reserved but not holding the mentioned lock.
+         * Members protected by a bo reservation.
          */
 
         void *sync_obj;
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 5c8bb5699a6f..e1ee141e26cc 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -521,8 +521,6 @@ struct ttm_bo_global {
  *
  * @driver: Pointer to a struct ttm_bo_driver struct setup by the driver.
  * @man: An array of mem_type_managers.
- * @fence_lock: Protects the synchronizing members on *all* bos belonging
- * to this device.
  * @vma_manager: Address space manager
  * lru_lock: Spinlock that protects the buffer+device lru lists and
  * ddestroy lists.
@@ -542,7 +540,6 @@ struct ttm_bo_device {
         struct ttm_bo_global *glob;
         struct ttm_bo_driver *driver;
         struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES];
-        spinlock_t fence_lock;
 
         /*
          * Protected by internal locks.