File 5e5e7188-fix-error-path-in-cpupool_unassign_cpu... of Package xen

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File 5e5e7188-fix-error-path-in-cpupool_unassign_cpu_start.patch of Package xen (Revision 73701fec6417d6e0a97d142e00040081)

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# Commit 98ed1f43cc2c89efd38deed1035dba5b1ced5d45
# Date 2020-03-03 16:02:32 +0100
# Author Juergen Gross <jgross@suse.com>
# Committer Jan Beulich <jbeulich@suse.com>
sched: fix error path in cpupool_unassign_cpu_start()

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()).

While at it indent the present error label by one space.

Reported-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Dario Faggioli <dfaggioli@suse.com>

--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -465,7 +465,7 @@ static int cpupool_unassign_cpu_start(st
         }
         rcu_read_unlock(&domlist_read_lock);
         if ( ret )
-            goto out;
+            goto out_rcu;
     }
     cpupool_moving_cpu = cpu;
     atomic_inc(&c->refcnt);
@@ -473,8 +473,9 @@ static int cpupool_unassign_cpu_start(st
     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:
+ out_rcu:
+    rcu_read_unlock(&sched_res_rculock);
+ out:
     spin_unlock(&cpupool_lock);
 
     return ret;

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File 5e5e7188-fix-error-path-in-cpupool_unassign_cpu_start.patch of Package xen (Revision 73701fec6417d6e0a97d142e00040081)

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