[PATCH 7/8] drm/i915/selftest: Always cancel semaphore on error

[Ramalingam C]

From: Chris Wilson <chris at chris-wilson.co.uk>

Ensure that we always signal the semaphore when timing out, so that if it
happens to be stuck waiting for the semaphore we will quickly recover
without having to wait for a reset.

Reported-by: CQ Tang <cq.tang at intel.com>
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
 drivers/gpu/drm/i915/gt/selftest_lrc.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index d8face764ee4..63fd508fea49 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -1530,20 +1530,17 @@ __lrc_isolation(struct intel_engine_cs *engine, u32 poison, bool relative)
 		usleep_range(100, 500);
 
 	err = poison_registers(B, engine, poison, relative, &sema);
-	if (err) {
-		WRITE_ONCE(*sema.va, -1);
-		i915_request_put(rq);
-		goto err_result1;
-	}
-
-	if (i915_request_wait(rq, 0, HZ / 2) < 0) {
+	if (err == 0 && i915_request_wait(rq, 0, HZ / 2) < 0) {
 		pr_err("%s(%s): wait for results timed out\n",
 		       __func__, engine->name);
-		i915_request_put(rq);
 		err = -ETIME;
-		goto err_result1;
 	}
+
+	/* Always cancel the semaphore wait, just in case the GPU gets stuck */
+	WRITE_ONCE(*sema.va, -1);
 	i915_request_put(rq);
+	if (err)
+		goto err_result1;
 
 	err = compare_isolation(engine, ref, result, A, poison, relative);
 
-- 
2.20.1