Commit 783c06cb authored Nov 17, 2017 by Lucas Stach

drm/etnaviv: add lockdep annotation for userptr object population



The current userptr page population will defer work to a work item if
needed to avoid ever taking the mmap_sem in the direct call path. With
the more fine-grained locking in etnaviv this isn't needed anymore, so
a future commit will simplify this code.

Add a lockdep annotation to validate the assumption that the mmap_sem
can be taken in the direct call path.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

parent d6a8743d

drivers/gpu/drm/etnaviv/etnaviv_gem.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -804,6 +804,8 @@ static int etnaviv_gem_userptr_get_pages(struct etnaviv_gem_object *etnaviv_obj)
		struct mm_struct *mm;
		int ret, pinned, npages = etnaviv_obj->base.size >> PAGE_SHIFT;

		might_lock_read(&current->mm->mmap_sem);

		if (etnaviv_obj->userptr.work) {
		if (IS_ERR(etnaviv_obj->userptr.work)) {
		ret = PTR_ERR(etnaviv_obj->userptr.work);