[PATCH 5/5] xen/domain: Make rangeset_domain_destroy() idempotent

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

... and move it into the common __domain_destroy() path.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien.grall@arm.com>
---
 xen/common/domain.c   | 9 +++------
 xen/common/rangeset.c | 3 +++
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/xen/common/domain.c b/xen/common/domain.c
index d1c1993..2f2f152 100644
--- a/xen/common/domain.c
+++ b/xen/common/domain.c
@@ -272,6 +272,8 @@ static void __domain_destroy(struct domain *d)
 
     xfree(d->pbuf);
 
+    rangeset_domain_destroy(d);
+
     free_cpumask_var(d->dirty_cpumask);
 
     xsm_free_security_domain(d);
@@ -286,7 +288,7 @@ struct domain *domain_create(domid_t domid,
                              bool is_priv)
 {
     struct domain *d, **pd, *old_hwdom = NULL;
-    enum { INIT_watchdog = 1u<<1, INIT_rangeset = 1u<<2,
+    enum { INIT_watchdog = 1u<<1,
            INIT_evtchn = 1u<<3, INIT_gnttab = 1u<<4, INIT_arch = 1u<<5 };
     int err, init_status = 0;
 
@@ -350,7 +352,6 @@ struct domain *domain_create(domid_t domid,
         goto fail;
 
     rangeset_domain_initialise(d);
-    init_status |= INIT_rangeset;
 
     /* DOMID_{XEN,IO,etc} (other than IDLE) are sufficiently constructed. */
     if ( is_system_domain(d) && !is_idle_domain(d) )
@@ -475,8 +476,6 @@ struct domain *domain_create(domid_t domid,
         evtchn_destroy_final(d);
         radix_tree_destroy(&d->pirq_tree, free_pirq_struct);
     }
-    if ( init_status & INIT_rangeset )
-        rangeset_domain_destroy(d);
     if ( init_status & INIT_watchdog )
         watchdog_domain_destroy(d);
 
@@ -882,8 +881,6 @@ static void complete_domain_destroy(struct rcu_head *head)
 
     watchdog_domain_destroy(d);
 
-    rangeset_domain_destroy(d);
-
     sched_destroy_domain(d);
 
     /* Free page used by xen oprofile buffer. */
diff --git a/xen/common/rangeset.c b/xen/common/rangeset.c
index 7788cdd..e3857ab 100644
--- a/xen/common/rangeset.c
+++ b/xen/common/rangeset.c
@@ -482,6 +482,9 @@ void rangeset_domain_destroy(
 {
     struct rangeset *r;
 
+    if ( list_head_is_null(&d->rangesets) )
+        return;
+
     while ( !list_empty(&d->rangesets) )
     {
         r = list_entry(d->rangesets.next, struct rangeset, rangeset_list);
-- 
2.1.4


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