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drm/radeon: hold reference to fences in radeon_sa_bo_new

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An arbitrary amount of time can pass between spin_unlock and
radeon_fence_wait_any, so we need to ensure that nobody frees the
fences from under us.

Based on the analogous fix for amdgpu.

Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Nicolai Hähnle 2016-02-05 14:35:53 -05:00 committed by Alex Deucher
parent b19763d0d8
commit f6ff4f67cd
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/radeon/radeon_sa.c
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@ -349,8 +349,13 @@ int radeon_sa_bo_new(struct radeon_device *rdev,
/* see if we can skip over some allocations */
} while (radeon_sa_bo_next_hole(sa_manager, fences, tries));
for (i = 0; i < RADEON_NUM_RINGS; ++i)
radeon_fence_ref(fences[i]);
spin_unlock(&sa_manager->wq.lock);
r = radeon_fence_wait_any(rdev, fences, false);
for (i = 0; i < RADEON_NUM_RINGS; ++i)
radeon_fence_unref(&fences[i]);
spin_lock(&sa_manager->wq.lock);
/* if we have nothing to wait for block */
if (r == -ENOENT) {