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drm/etnaviv: add lockdep annotation for userptr object population

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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>
This commit is contained in:
Lucas Stach
2018-01-02 17:04:18 +01:00
parent d6a8743dd8
commit 783c06cb9c
1 changed files with 2 additions and 0 deletions
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drivers/gpu/drm/etnaviv/etnaviv_gem.c
+2
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@@ -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);