drm/amdgpu: fix deadlock of reservation between cs and gpu reset v2

the case could happen when gpu reset:
1. when gpu reset, cs can be continue until sw queue is full, then push job will wait with holding pd reservation.
2. gpu_reset routine will also need pd reservation to restore page table from their shadow.
3. cs is waiting for gpu_reset complete, but gpu reset is waiting for cs releases reservation.

v2: handle amdgpu_cs_submit error path.

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index ec71b9320561..4e6b9501ab0a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1074,6 +1074,7 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
         cs->out.handle = amdgpu_ctx_add_fence(p->ctx, ring, p->fence);
         job->uf_sequence = cs->out.handle;
         amdgpu_job_free_resources(job);
+        amdgpu_cs_parser_fini(p, 0, true);
 
         trace_amdgpu_cs_ioctl(job);
         amd_sched_entity_push_job(&job->base);
@@ -1129,7 +1130,10 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
                 goto out;
 
         r = amdgpu_cs_submit(&parser, cs);
+        if (r)
+                goto out;
 
+        return 0;
 out:
         amdgpu_cs_parser_fini(&parser, r, reserved_buffers);
         return r;