[PATCH] drm/amd: fix memory leak in amdgpu_cs_sync_rings

[Bert Karwatzki]

Here is the fix for (send again to test if I can get it right with
Evolution)
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/2360

From 6e064c9565ef0da890f3fcb2a4f6a8cd44a12fdb Mon Sep 17 00:00:00 2001
From: Bert Karwatzki <spasswolf at web.de>
Date: Thu, 2 Feb 2023 19:50:27 +0100
Subject: [PATCH] Fix memory leak in amdgpu_cs_sync_rings.

Signed-off-by: Bert Karwatzki <spasswolf at web.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 0f4cb41078c1..08eced097bd8 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1222,10 +1222,13 @@ static int amdgpu_cs_sync_rings(struct
amdgpu_cs_parser *p)
                 * next job actually sees the results from the
previous one
                 * before we start executing on the same scheduler
ring.
                 */
-               if (!s_fence || s_fence->sched != sched)
+               if (!s_fence || s_fence->sched != sched) {
+                       dma_fence_put(fence);
                        continue;
+               }
 
                r = amdgpu_sync_fence(&p->gang_leader->explicit_sync,
fence);
+               dma_fence_put(fence);
                if (r)
                        return r;
        }