drm/ttm: Be consistent on ttm_bo_init() failures
Call destroy() on _all_ ttm_bo_init() failures, and make sure that
behavior is documented in the function description.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index ce46457..3ca77dc 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1144,6 +1144,10 @@
num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (num_pages == 0) {
printk(KERN_ERR TTM_PFX "Illegal buffer object size.\n");
+ if (destroy)
+ (*destroy)(bo);
+ else
+ kfree(bo);
return -EINVAL;
}
bo->destroy = destroy;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 5afa5b5..beafc15 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -432,6 +432,10 @@
* together with the @destroy function,
* enables driver-specific objects derived from a ttm_buffer_object.
* On successful return, the object kref and list_kref are set to 1.
+ * If a failure occurs, the function will call the @destroy function, or
+ * kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is
+ * illegal and will likely cause memory corruption.
+ *
* Returns
* -ENOMEM: Out of memory.
* -EINVAL: Invalid placement flags.