Read the current value before computing the expected to ensure that if
the timer does complete early (against our will), it should not cause a
false positive.
v2: The local irq disable did not prevent the timer from running.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_uncore.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 2042c94c9cc9..bb9e0da30e94 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -758,19 +758,18 @@ void assert_forcewakes_active(struct intel_uncore *uncore,
* Check that the caller has an explicit wakeref and we don't mistake
* it for the auto wakeref.
*/
- local_irq_disable();
for_each_fw_domain_masked(domain, fw_domains, uncore, tmp) {
+ unsigned int actual = READ_ONCE(domain->wake_count);
unsigned int expect = 1;
if (hrtimer_active(&domain->timer) && READ_ONCE(domain->active))
expect++; /* pending automatic release */
- if (WARN(domain->wake_count < expect,
+ if (WARN(actual < expect,
"Expected domain %d to be held awake by caller, count=%d\n",
- domain->id, domain->wake_count))
+ domain->id, actual))
break;
}
- local_irq_enable();
}
/* We give fast paths for the really cool registers */
--
2.20.1
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