On Fri, May 23, 2014 at 6:41 PM, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote:
> 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 initial pattern.
I've definitely debugged one of those problems. Do you have any actual
fixes or there are no errors in the kernel?
Rob
>
> Cc: Mitchel Humpherys <mitchelh@xxxxxxxxxxxxxx>
> Cc: Julia Lawall <Julia.Lawall@xxxxxxx>
> Cc: Gilles Muller <Gilles.Muller@xxxxxxx>
> Cc: Nicolas Palix <nicolas.palix@xxxxxxx>
> Cc: Grant Likely <grant.likely@xxxxxxxxxx>
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> ---
> scripts/coccinelle/misc/of_table.cocci | 81 ++++++++++++++++++++++++++++++++++
> 1 file changed, 81 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..da8bfa69fa3e
> --- /dev/null
> +++ b/scripts/coccinelle/misc/of_table.cocci
> @@ -0,0 +1,81 @@
> +/// 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)
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> hosted by The Linux Foundation
>
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