Xen devel - Sep 2011 - [PATCH] xen: if mapping GSIs we run out of pirq < nr_irqs_gsi, use the others

PV on HVM guests can have more GSIs than the host, in that case we could
run out of pirq < nr_irqs_gsi. When that happens use pirq >nr_irqs_gsi
rather than returning an error.

This patch should be backported to xen 4.1, the backport is attached.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Tested-by: Benjamin Schweikert <b.schweikert@googlemail.com>

diff -r 5260d04148cb xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c	Fri Sep 09 11:03:38 2011 +0000
+++ b/xen/arch/x86/irq.c	Fri Sep 09 15:06:40 2011 +0000
@@ -1646,15 +1646,12 @@ int get_free_pirq(struct domain *d, int 
                 return i;
             }
     }
-    else
-    {
-        for ( i = d->nr_pirqs - 1; i >= nr_irqs_gsi; i-- )
-            if ( is_free_pirq(d, pirq_info(d, i)) )
-            {
-                pirq_get_info(d, i);
-                return i;
-            }
-    }
+    for ( i = d->nr_pirqs - 1; i >= nr_irqs_gsi; i-- )
+        if ( is_free_pirq(d, pirq_info(d, i)) )
+        {
+            pirq_get_info(d, i);
+            return i;
+        }
 
     return -ENOSPC;
 }

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