[PATCH v2] coccinelle: Check for missing NULL terminators in of_device_id tables

[Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

Failure to terminate an of_device_id table can lead to confusing
failures depending on where the compiler places the array. Add a
check to make sure these tables are terminated. Thanks to Mitchel
Humpherys for coming up with the pattern initially.

Cc: Mitchel Humpherys <mitchelh-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
Cc: Julia Lawall <Julia.Lawall-L2FTfq7BK8M@public.gmane.org>
Cc: Gilles Muller <Gilles.Muller-L2FTfq7BK8M@public.gmane.org>
Cc: Nicolas Palix <nicolas.palix-wMUr/XMoy4A@public.gmane.org>
Cc: Grant Likely <grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
Cc: Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
---
 scripts/coccinelle/misc/of_table.cocci | 73 ++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 scripts/coccinelle/misc/of_table.cocci

diff --git a/scripts/coccinelle/misc/of_table.cocci b/scripts/coccinelle/misc/of_table.cocci
new file mode 100644
index 000000000000..838c74c418c9
--- /dev/null
+++ b/scripts/coccinelle/misc/of_table.cocci
@@ -0,0 +1,73 @@
+/// Make sure of_device_id tables are NULL terminated
+//
+// Keywords: of_table
+// Confidence: Medium
+// Options: --include-headers
+
+virtual patch
+virtual context
+virtual org
+virtual report
+
+@bad_of_table exists@
+identifier var, arr;
+expression E;
+@@
+struct of_device_id arr[] = {
+	...,
+	{
+	.var = E,
+	}
+};
+
+@depends on bad_of_table && context@
+identifier var, arr;
+expression E;
+@@
+struct of_device_id arr[] = {
+	...,
+	{
+*	.var = E,
+	}
+};
+
+@depends on bad_of_table && patch@
+identifier var, arr;
+expression E;
+@@
+struct of_device_id arr[] = {
+	...,
+	{
+	.var = E,
+-	}
++	},
++	{ }
+};
+
+@r depends on bad_of_table exists@
+position p1;
+identifier var, arr;
+expression E;
+@@
+struct of_device_id arr[] = {
+	...,
+	{
+	.var = E,
+	}
+	@p1
+};
+
+@script:python depends on org@
+p1 << r.p1;
+arr << r.arr;
+@@
+
+cocci.print_main(arr,p1)
+
+@script:python depends on report@
+p1 << r.p1;
+arr << r.arr;
+@@
+
+msg = "%s is not NULL terminated at line %s" % (arr, p1[0].line)
+coccilib.report.print_report(p1[0],msg)
-- 
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