From: Nicolai Hähnle <nicolai.haehnle@xxxxxxx>
This patch has been added to the 3.12 stable tree. If you have any
objections, please let us know.
===============
[Backport of upstream commit f6ff4f67cdf8455d0a4226eeeaf5af17c37d05eb, with
an additional NULL pointer guard that is required for kernels 3.17 and older.
To be precise, any kernel that does *not* have commit 954605ca3 "drm/radeon:
use common fence implementation for fences, v4" requires this additional
NULL pointer guard.]
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@xxxxxxx>
Reviewed-by: Christian König <christian.koenig@xxxxxxx> (v1 + fix)
Tested-by: Lutz Euler <lutz.euler@xxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_sa.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c
index f0bac68254b7..8962411b5f2b 100644
--- a/drivers/gpu/drm/radeon/radeon_sa.c
+++ b/drivers/gpu/drm/radeon/radeon_sa.c
@@ -349,8 +349,15 @@ 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) {
+ if (fences[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 && block) {
--
2.8.1
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