uwq_trywork bug fix

b40a7ea0 · Silas Boyd-Wickizer · 804c1733 · b40a7ea0
--- a/kernel/uwq.cc
+++ b/kernel/uwq.cc
@@ -36,9 +36,11 @@ uwq_trywork(void)
    barrier();

    struct proc *p = c->proc;
-    if (p == nullptr || p->uwq == nullptr)
+    if (p == nullptr)
      continue;
    uwq* uwq = p->uwq;
+    if (uwq == nullptr)
+      continue;

    if (uwq->haswork()) {
      if (uwq->tryworker())