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drm/amd/amdgpu: lock reservation object while creating shadow bo

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ttm_bo_init checks that the reservation object is locked. This is
the caller's responsibility when resv != NULL. Otherwise, the inline
reservation object of the newly allocated buffer is used and must
explicitly be locked.

Uninterruptible w/w locks without an acquire context are always
successful.

v2: use ww_mutex_lock

Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net> (v1)
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicolai Hähnle 2017-01-10 19:06:00 +01:00 committed by Alex Deucher
parent 54170226a6
commit 36ea83d151
1 changed files with 9 additions and 0 deletions
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9
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
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@ -472,7 +472,16 @@ int amdgpu_bo_create(struct amdgpu_device *adev,
return r;
if (amdgpu_need_backup(adev) && (flags & AMDGPU_GEM_CREATE_SHADOW)) {
if (!resv) {
r = ww_mutex_lock(&(*bo_ptr)->tbo.resv->lock, NULL);
WARN_ON(r != 0);
}
r = amdgpu_bo_create_shadow(adev, size, byte_align, (*bo_ptr));
if (!resv)
ww_mutex_unlock(&(*bo_ptr)->tbo.resv->lock);
if (r)
amdgpu_bo_unref(bo_ptr);
}