From: Chris Wilson chris@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@intel.com Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: CQ Tang cq.tang@intel.com cc: Joonas Lahtinen joonas.lahtinen@linux.intel.com Signed-off-by: Ramalingam C ramalingam.c@intel.com --- drivers/gpu/drm/i915/gt/selftest_lrc.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c index b9cc89de01bf..ae16668dd9d4 100644 --- a/drivers/gpu/drm/i915/gt/selftest_lrc.c +++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c @@ -1435,18 +1435,17 @@ static int __lrc_isolation(struct intel_engine_cs *engine, u32 poison) }
err = poison_registers(B, poison, sema); - if (err) { - WRITE_ONCE(*sema, -1); - i915_request_put(rq); - goto err_result1; - } - - if (i915_request_wait(rq, 0, HZ / 2) < 0) { - i915_request_put(rq); + if (err == 0 && i915_request_wait(rq, 0, HZ / 2) < 0) { + pr_err("%s(%s): wait for results timed out\n", + __func__, engine->name); err = -ETIME; - goto err_result1; } + + /* Always cancel the semaphore wait, just in case the GPU gets stuck */ + WRITE_ONCE(*sema, -1); i915_request_put(rq); + if (err) + goto err_result1;
err = compare_isolation(engine, ref, result, A, poison);