amdgpu: Don't dereference device_handle after amdgpu_device_deinitialize

Fixes use after free:

==2537== Invalid read of size 4
==2537==    at 0x1162C9: suite_deadlock_tests_enable (deadlock_tests.c:101)
==2537==    by 0x10B157: amdgpu_disable_suits (amdgpu_test.c:421)
==2537==    by 0x10B157: main (amdgpu_test.c:560)
==2537==  Address 0x5e44f24 is 452 bytes inside a block of size 1,016 free'd
==2537==    at 0x4C2BE1B: free (vg_replace_malloc.c:530)
==2537==    by 0x504CD8B: amdgpu_device_reference (amdgpu_device.c:164)
==2537==    by 0x504CD8B: amdgpu_device_deinitialize (amdgpu_device.c:307)
==2537==    by 0x1162BB: suite_deadlock_tests_enable (deadlock_tests.c:97)
==2537==    by 0x10B157: amdgpu_disable_suits (amdgpu_test.c:421)
==2537==    by 0x10B157: main (amdgpu_test.c:560)
==2537==  Block was alloc'd at
==2537==    at 0x4C2CC05: calloc (vg_replace_malloc.c:711)
==2537==    by 0x504CA5E: amdgpu_device_initialize (amdgpu_device.c:212)
==2537==    by 0x116298: suite_deadlock_tests_enable (deadlock_tests.c:93)
==2537==    by 0x10B157: amdgpu_disable_suits (amdgpu_test.c:421)
==2537==    by 0x10B157: main (amdgpu_test.c:560)

Reviewed-by: Christian König <christian.koenig@amd.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/tests/amdgpu/deadlock_tests.c b/tests/amdgpu/deadlock_tests.c
index 84f4debe..cd34cdf6 100644
--- a/tests/amdgpu/deadlock_tests.c
+++ b/tests/amdgpu/deadlock_tests.c
@@ -90,20 +90,21 @@ static void amdgpu_deadlock_compute(void);
 
 CU_BOOL suite_deadlock_tests_enable(void)
 {
+        CU_BOOL enable = CU_TRUE;
+
         if (amdgpu_device_initialize(drm_amdgpu[0], &major_version,
                                              &minor_version, &device_handle))
                 return CU_FALSE;
 
-        if (amdgpu_device_deinitialize(device_handle))
-                return CU_FALSE;
-
-
         if (device_handle->info.family_id == AMDGPU_FAMILY_AI) {
                 printf("\n\nCurrently hangs the CP on this ASIC, deadlock suite disabled\n");
-                return CU_FALSE;
+                enable = CU_FALSE;
         }
 
-        return CU_TRUE;
+        if (amdgpu_device_deinitialize(device_handle))
+                return CU_FALSE;
+
+        return enable;
 }
 
 int suite_deadlock_tests_init(void)