[Xen-devel] [PATCH] xen/sched: fix error path in cpupool_unassign_cpu_start()

[Juergen Gross <jgross@xxxxxxxx>]

In case moving away all domains from the cpu to be removed is failing
in cpupool_unassign_cpu_start() the error path is missing to release
sched_res_rculock.

The normal exit path is releasing domlist_read_lock instead (this is
currently no problem as the reference to the specific rcu lock is not
used by rcu_read_unlock()).

Reported-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 xen/common/sched/cpupool.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c
index b7721b5d02..4bf3d8434d 100644
--- a/xen/common/sched/cpupool.c
+++ b/xen/common/sched/cpupool.c
@@ -466,7 +466,7 @@ static int cpupool_unassign_cpu_start(struct cpupool *c, 
unsigned int cpu)
         }
         rcu_read_unlock(&domlist_read_lock);
         if ( ret )
-            goto out;
+            goto out_rcu;
     }
     cpupool_moving_cpu = cpu;
     atomic_inc(&c->refcnt);
@@ -474,7 +474,8 @@ static int cpupool_unassign_cpu_start(struct cpupool *c, 
unsigned int cpu)
     cpumask_andnot(c->cpu_valid, c->cpu_valid, cpus);
     cpumask_and(c->res_valid, c->cpu_valid, &sched_res_mask);
 
-    rcu_read_unlock(&domlist_read_lock);
+out_rcu:
+    rcu_read_unlock(&sched_res_rculock);
 out:
     spin_unlock(&cpupool_lock);
 
-- 
2.16.4


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