On Tue, Mar 04, 2014 at 06:54:24AM -0800, Tim Harvey wrote:
> When an interrupt-map contains multiple entries an imap pointer arithmetic
> bug can cause only the first entry to be properly evaluated and causes
> the out_irq parameters to be incorrect depending on the #interrupt-cells
> and #address-cells of the parent interrupt controller.
Tim,
I took a bit closer look at this for you, and I suspect the root fix
is this:
--- a/Documentation/devicetree/bindings/arm/gic.txt
+++ b/Documentation/devicetree/bindings/arm/gic.txt
@@ -55,7 +55,6 @@ Example:
intc: interrupt-controller@fff11000 {
compatible = "arm,cortex-a9-gic";
#interrupt-cells = <3>;
- #address-cells = <1>;
interrupt-controller;
reg = <0xfff11000 0x1000>,
<0xfff10100 0x100>;
(plus the corresponding purge from the .dt files)
It looks like the implementation does follow the OF specification:
Each mapping entry consists of a 3-tuple of (child-interrupt,
interrupt-parent, parent-interrupt). The number of cells for the
child-interrupt specifier is determined by the "#address-cells" and
"#interrupt-cells"property of this node. The number of cells for the
parent-interrupt value is determined by the "#address-cells"and
"#interrupt-cells"property values of this node's
interrupt-parent.
So by specifying interrupt-cells = 3, address-cells = 1, the GIC is
requiring 4 DWs for its interrupt specifier.
I see no reason why it doesn't have an address-cells = 0 like other
interrupt controllers..
Setting #address-cells to 0 in the GIC node should be functionally
equivalent to your patch below, since newaddrsize will == 0.
Regards,
Jason
> diff --git a/drivers/of/irq.c b/drivers/of/irq.c
> index 9bcf2cf..8829197 100644
> +++ b/drivers/of/irq.c
> @@ -237,11 +237,11 @@ int of_irq_parse_raw(const __be32 *addr, struct
> of_phandle_args *out_irq)
> /* Check for malformed properties */
> if (WARN_ON(newaddrsize + newintsize >
> MAX_PHANDLE_ARGS))
> goto fail;
> - if (imaplen < (newaddrsize + newintsize))
> + if (imaplen < newintsize)
> goto fail;
>
> - imap += newaddrsize + newintsize;
> - imaplen -= newaddrsize + newintsize;
> + imap += newintsize;
> + imaplen -= newintsize;
>
> pr_debug(" -> imaplen=%d\n", imaplen);
> }
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