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From: Ian Lepore <ian@FreeBSD.org>
Date: Sun, 2 Feb 2014 16:56:41 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r261405 - head/sys/dev/fdt
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Author: ian
Date: Sun Feb  2 16:56:40 2014
New Revision: 261405
URL: http://svnweb.freebsd.org/changeset/base/261405

Log:
  Be more robust with malformed interrupt config data.  Instead of crashing
  or going into a near-infinite loop, warn and make potentially-reasonable
  assumptions.

Modified:
  head/sys/dev/fdt/simplebus.c

Modified: head/sys/dev/fdt/simplebus.c
==============================================================================
--- head/sys/dev/fdt/simplebus.c	Sun Feb  2 16:42:26 2014	(r261404)
+++ head/sys/dev/fdt/simplebus.c	Sun Feb  2 16:56:40 2014	(r261405)
@@ -287,11 +287,23 @@ simplebus_setup_dinfo(device_t dev, phan
 	nintr = OF_getencprop_alloc(node, "interrupts",  sizeof(*intr),
 	    (void **)&intr);
 	if (nintr > 0) {
-		iparent = 0;
-		OF_searchencprop(node, "interrupt-parent", &iparent,
-		    sizeof(iparent));
-		OF_searchencprop(OF_xref_phandle(iparent), "#interrupt-cells",
-		    &icells, sizeof(icells));
+		if (OF_searchencprop(node, "interrupt-parent", &iparent,
+		    sizeof(iparent)) == -1) {
+			device_printf(dev, "No interrupt-parent found, "
+			    "assuming direct parent\n");
+			iparent = OF_parent(node);
+		}
+		if (OF_searchencprop(OF_xref_phandle(iparent), 
+		    "#interrupt-cells", &icells, sizeof(icells)) == -1) {
+			device_printf(dev, "Missing #interrupt-cells property, "
+			    "assuming <1>\n");
+			icells = 1;
+		}
+		if (icells < 1 || icells > nintr) {
+			device_printf(dev, "Invalid #interrupt-cells property "
+			    "value <%d>, assuming <1>\n", icells);
+			icells = 1;
+		}
 		for (i = 0, k = 0; i < nintr; i += icells, k++) {
 			intr[i] = ofw_bus_map_intr(dev, iparent, icells,
 			    &intr[i]);