Revert 19661:326b24bfa9f9 "Free pirq_to_evtchn/pirq_mask..."

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

xen/common/domain.c

@@ -261,6 +261,13 @@ struct domain *domain_create(
         if ( evtchn_init(d) != 0 )
             goto fail;
         init_status |= INIT_evtchn;
+        d->pirq_to_evtchn = xmalloc_array(u16, d->nr_pirqs);
+        d->pirq_mask = xmalloc_array(unsigned long,
+                                     BITS_TO_LONGS(d->nr_pirqs));
+        if ( !d->pirq_to_evtchn || !d->pirq_mask )
+            goto fail;
+        memset(d->pirq_to_evtchn, 0, d->nr_pirqs * sizeof(*d->pirq_to_evtchn));
+        bitmap_zero(d->pirq_mask, d->nr_pirqs);
 
         if ( grant_table_create(d) != 0 )
             goto fail;
@@ -303,7 +310,11 @@ struct domain *domain_create(
     if ( init_status & INIT_gnttab )
         grant_table_destroy(d);
     if ( init_status & INIT_evtchn )
+    {
+        xfree(d->pirq_mask);
+        xfree(d->pirq_to_evtchn);
         evtchn_destroy(d);
+    }
     if ( init_status & INIT_rangeset )
         rangeset_domain_destroy(d);
     if ( init_status & INIT_xsm )

xen/common/event_channel.c

@@ -1013,27 +1013,10 @@ void notify_via_xen_event_channel(int lport)
 int evtchn_init(struct domain *d)
 {
     spin_lock_init(&d->event_lock);
-
-    d->pirq_to_evtchn = xmalloc_array(u16, d->nr_pirqs);
-    d->pirq_mask = xmalloc_array(
-        unsigned long, BITS_TO_LONGS(d->nr_pirqs));
-    if ( (d->pirq_to_evtchn == NULL) || (d->pirq_mask == NULL) )
-        goto fail;
-    memset(d->pirq_to_evtchn, 0, d->nr_pirqs * sizeof(*d->pirq_to_evtchn));
-    bitmap_zero(d->pirq_mask, d->nr_pirqs);
-
     if ( get_free_port(d) != 0 )
-        goto fail;
+        return -EINVAL;
     evtchn_from_port(d, 0)->state = ECS_RESERVED;
-
     return 0;
-
- fail:
-    xfree(d->pirq_to_evtchn);
-    d->pirq_to_evtchn = NULL;
-    xfree(d->pirq_mask);
-    d->pirq_mask = NULL;
-    return -ENOMEM;
 }
 
 
@@ -1061,11 +1044,6 @@ void evtchn_destroy(struct domain *d)
         d->evtchn[i] = NULL;
     }
     spin_unlock(&d->event_lock);
-
-    xfree(d->pirq_to_evtchn);
-    d->pirq_to_evtchn = NULL;
-    xfree(d->pirq_mask);
-    d->pirq_mask = NULL;
 }
 
 static void domain_dump_evtchn_info(struct domain *d)