[Xen-devel] [PATCH] cpupools: retry cpupool-destroy if domain in cpupool is dying

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

When a cpupool is destroyed just after the last domain has been stopped the
domain might already be removed from the domain list without being removed
from the cpupool.
It is easy to detect this situation and to return EAGAIN in this case which
is already handled in libxc by doing a retry.

Signed-off-by: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
---
 xen/common/cpupool.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index 4a0e569..ac833f0 100644
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -348,6 +348,8 @@ static int cpupool_unassign_cpu(struct cpupool *c, unsigned 
int cpu)
             cpupool0->n_dom++;
         }
         rcu_read_unlock(&domlist_read_lock);
+        if ( (c->n_dom > 0) && !ret )
+            ret = -EAGAIN;
         if ( ret )
             goto out;
     }
-- 
1.7.10.4


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