[PATCH 5/6] xen/domain: Call sched_destroy_domain() in the domain_create() error path

[Andrew Cooper <andrew.cooper3@citrix.com>]

If domain_create() fails, complete_domain_destroy() doesn't get called,
meaning that sched_destroy_domain() is missed.  In practice, this can only
fail because of exceptional late_hwdom_init() issues at the moment.

Make sched_destroy_domain() idempotent, and call it in the fail path.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: George Dunlap <George.Dunlap@eu.citrix.com>
CC: Jan Beulich <JBeulich@suse.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Tim Deegan <tim@xen.org>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Dario Faggioli <dfaggioli@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
---
 xen/common/domain.c   |  3 +++
 xen/common/schedule.c | 14 ++++++++------
 2 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index e0b024c..3cefe76 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -404,6 +404,9 @@ struct domain *domain_create(domid_t domid, unsigned int domcr_flags,
         hardware_domain = old_hwdom;
     atomic_set(&d->refcnt, DOMAIN_DESTROYED);
     xfree(d->pbuf);
+
+    sched_destroy_domain(d);
+
     if ( init_status & INIT_arch )
         arch_domain_destroy(d);
     if ( init_status & INIT_gnttab )
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index 5f596f0..64524f4 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -436,16 +436,18 @@ int sched_init_domain(struct domain *d, int poolid)
 
 void sched_destroy_domain(struct domain *d)
 {
-    ASSERT(d->cpupool != NULL || is_idle_domain(d));
     ASSERT(d->domain_id < DOMID_FIRST_RESERVED);
 
-    SCHED_STAT_CRANK(dom_destroy);
-    TRACE_1D(TRC_SCHED_DOM_REM, d->domain_id);
+    if ( d->cpupool )
+    {
+        SCHED_STAT_CRANK(dom_destroy);
+        TRACE_1D(TRC_SCHED_DOM_REM, d->domain_id);
 
-    sched_free_domdata(dom_scheduler(d), d->sched_priv);
-    d->sched_priv = NULL;
+        sched_free_domdata(dom_scheduler(d), d->sched_priv);
+        d->sched_priv = NULL;
 
-    cpupool_rm_domain(d);
+        cpupool_rm_domain(d);
+    }
 }
 
 void vcpu_sleep_nosync(struct vcpu *v)
-- 
2.1.4


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