As we flush each test and wait for idle before the next, also switch
back to the kernel context. This helps limit the amount of collateral
damage a test may cause by resetting to the default state each time (and
also helps clean up temporaries used by the test).

Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
---
 drivers/gpu/drm/i915/selftests/igt_flush_test.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/igt_flush_test.c 
b/drivers/gpu/drm/i915/selftests/igt_flush_test.c
index abff2f04ea84..7f35bddc2e95 100644
--- a/drivers/gpu/drm/i915/selftests/igt_flush_test.c
+++ b/drivers/gpu/drm/i915/selftests/igt_flush_test.c
@@ -57,6 +57,11 @@ int igt_flush_test(struct drm_i915_private *i915, unsigned 
int flags)
 
        cond_resched();
 
+       if (i915_gem_switch_to_kernel_context(i915)) {
+               pr_err("Failed to switch back to kernel context; declaring 
wedged\n");
+               i915_gem_set_wedged(i915);
+       }
+
        wedge_on_timeout(&w, i915, HZ)
                i915_gem_wait_for_idle(i915, flags);
 
-- 
2.17.0

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