[PATCH] tests/intel/xe_exec_system_allocator: fix prefetch-change-attr and DONTNEED flag handling

[nishit.sharma@intel.com]

From: Nishit Sharma <nishit.sharma@intel.com>

These changes fixes the prefetch-change-attr test flow so the intended
prefetch and atomic-attribute transition execute in the correct path,
and it also switches the skip-results condition to use the proper internal
test flag (USE_MADV_DONTNEED) instead of the libc MADV_DONTNEED constant.
Together, these updates remove dead-path behavior, make the intent explicit
and improve reliability of the affected system-allocator IGT coverage
across platforms.

Signed-off-by: Nishit Sharma <nishit.sharma@intel.com>
---
 tests/intel/xe_exec_system_allocator.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tests/intel/xe_exec_system_allocator.c b/tests/intel/xe_exec_system_allocator.c
index 6ca53aa5f..305512dfd 100644
--- a/tests/intel/xe_exec_system_allocator.c
+++ b/tests/intel/xe_exec_system_allocator.c
@@ -1395,6 +1395,9 @@ madvise_prefetch_op(int fd, uint32_t vm, uint64_t addr, size_t bo_size,
 
 		xe_vm_madvise_migrate_pages(fd, vm, to_user_pointer(data), bo_size / 2);
 
+		/* free 1st allocation in mem_attrs */
+		free(mem_attrs);
+
 		mem_attrs = xe_vm_get_mem_attr_values_in_range(fd, vm, addr, bo_size, &num_ranges);
 		if (!mem_attrs) {
 			igt_info("Failed to get memory attributes\n");
@@ -1426,13 +1429,14 @@ madvise_prefetch_op(int fd, uint32_t vm, uint64_t addr, size_t bo_size,
 		if (!mem_attrs) {
 			igt_info("Failed to get memory attributes\n");
 			return;
+		}
 
 		xe_vm_prefetch_async(fd, vm, 0, 0, addr, bo_size, NULL, 0,
 				     DRM_XE_CONSULT_MEM_ADVISE_PREF_LOC);
 
 		xe_vm_madvise_atomic_attr(fd, vm, to_user_pointer(data), bo_size,
 					  DRM_XE_ATOMIC_DEVICE);
-		}
+
 		free(mem_attrs);
 	}
 }
@@ -2333,7 +2337,7 @@ test_compute(int fd, struct drm_xe_engine_class_instance *eci, size_t size,
 	xe_wait_ufence(fd, &bo_sync->sync, USER_FENCE_VALUE, 0, FIVE_SEC);
 
 	env.loop_count = (flags & TOUCH_ONCE) ? 1 : env.array_size;
-	env.skip_results_check = !(flags & ACCESS_DEVICE_HOST) || (flags & MADV_DONTNEED);
+	env.skip_results_check = !(flags & ACCESS_DEVICE_HOST) || (flags & USE_MADV_DONTNEED);
 	env.vm = vm;
 
 	read_gt_stats_snapshot(fd, eci, &stats_before);
-- 
2.43.0