If timeout happens, kgd_hqd_destroy() just returns -ETIME leaving queue acquired.
It may cause a deadlock, so the patch proposes to release queue before return.
Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_kfd.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/radeon/radeon_kfd.c b/drivers/gpu/drm/radeon/radeon_kfd.c
index 242fd8b1b221..335e29dbab05 100644
--- a/drivers/gpu/drm/radeon/radeon_kfd.c
+++ b/drivers/gpu/drm/radeon/radeon_kfd.c
@@ -556,6 +556,7 @@ static int kgd_hqd_destroy(struct kgd_dev *kgd, uint32_t reset_type,
if (timeout == 0) {
pr_err("kfd: cp queue preemption time out (%dms)\n",
temp);
+ release_queue(kgd);
return -ETIME;
}
msleep(20);
--
1.9.1
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