[Xen-changelog] [xen-unstable] xen: if mapping GSIs we run out of pirq < nr_irqs_gsi, use the others

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
# Date 1315906344 -3600
# Node ID ad3b4bb097cb6308f73e597c5412395ad783ea4a
# Parent  53416e7c05297978985bd943f8d179599829dbf7
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.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Tested-by: Benjamin Schweikert <b.schweikert@xxxxxxxxxxxxxx>
---


diff -r 53416e7c0529 -r ad3b4bb097cb xen/arch/x86/irq.c
--- a/xen/arch/x86/irq.c        Tue Sep 13 10:30:09 2011 +0100
+++ b/xen/arch/x86/irq.c        Tue Sep 13 10:32:24 2011 +0100
@@ -1646,15 +1646,12 @@
                 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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