[ofw] [IBAL]Patch protect from possible null dereference.

[Alex Estrin]

Yossi,

Proposed patch is to verify device status flags before dereferencing
hca. This could be the case if IOU goes away before it had a chance to
complete initialization.
Please review.

Thanks,
Alex



Index: bus_iou_mgr.c
===================================================================
--- bus_iou_mgr.c	(revision 623)
+++ bus_iou_mgr.c	(working copy)
@@ -1370,6 +1370,14 @@
 		&GUID_BUS_INTERFACE_STANDARD ) )
 	{
 		p_ext = p_dev_obj->DeviceExtension;
+		
+		if( !p_ext->h_ca ||
+			!p_ext->b_present ||
+			p_ext->b_reported_missing )
+		{
+			return STATUS_NO_SUCH_DEVICE;
+		}
+
 		status = cl_fwd_query_ifc(
 			p_ext->h_ca->obj.p_ci_ca->verbs.p_hca_dev,
p_io_stack );
 	}
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