of/irq: Fix bug in interrupt parsing refactor.

Commit 2361613206e6, "of/irq: Refactor interrupt-map parsing" introduced
a bug. The irq parsing will fail for some nodes that don't have a reg
property. It is fixed by deferring the check for reg until it is
actually needed. Also adjust the testcase data to catch the bug.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Tested-by: Ming Lei <tom.leiming@gmail.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Cc: Rob Herring <rob.herring@calxeda.com>

2 files changed, 14 insertions, 13 deletions

diff --git a/arch/arm/boot/dts/testcases/tests-interrupts.dtsi b/arch/arm/boot/dts/testcases/tests-interrupts.dtsi
index 560d6bf680b6..c843720bd3e5 100644
--- a/arch/arm/boot/dts/testcases/tests-interrupts.dtsi
+++ b/arch/arm/boot/dts/testcases/tests-interrupts.dtsi
@@ -2,7 +2,8 @@
 / {
         testcase-data {
                 interrupts {
-                        #address-cells = <0>;
+                        #address-cells = <1>;
+                        #size-cells = <1>;
                         test_intc0: intc0 {
                                 interrupt-controller;
                                 #interrupt-cells = <1>;
@@ -29,8 +30,7 @@
 
                         test_intmap1: intmap1 {
                                 #interrupt-cells = <2>;
-                                #address-cells = <0>;
-                                interrupt-map = <1 2 &test_intc0 15>;
+                                interrupt-map = <0x5000 1 2 &test_intc0 15>;
                         };
 
                         interrupts0 {
@@ -44,6 +44,7 @@
                         };
 
                         interrupts-extended0 {
+                                reg = <0x5000 0x100>;
                                 interrupts-extended = <&test_intc0 1>,
                                                       <&test_intc1 2 3 4>,
                                                       <&test_intc2 5 6>,
diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 8cc62b4a7988..52dba6a01423 100644
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -147,18 +147,9 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
 
         pr_debug(" -> addrsize=%d\n", addrsize);
 
-        /* If we were passed no "reg" property and we attempt to parse
-         * an interrupt-map, then #address-cells must be 0.
-         * Fail if it's not.
-         */
-        if (addr == NULL && addrsize != 0) {
-                pr_debug(" -> no reg passed in when needed !\n");
-                return -EINVAL;
-        }
-
         /* Precalculate the match array - this simplifies match loop */
         for (i = 0; i < addrsize; i++)
-                initial_match_array[i] = addr[i];
+                initial_match_array[i] = addr ? addr[i] : 0;
         for (i = 0; i < intsize; i++)
                 initial_match_array[addrsize + i] = cpu_to_be32(out_irq->args[i]);
 
@@ -174,6 +165,15 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
                         return 0;
                 }
 
+                /*
+                 * interrupt-map parsing does not work without a reg
+                 * property when #address-cells != 0
+                 */
+                if (addrsize && !addr) {
+                        pr_debug(" -> no reg passed in when needed !\n");
+                        goto fail;
+                }
+
                 /* Now look for an interrupt-map */
                 imap = of_get_property(ipar, "interrupt-map", &imaplen);
                 /* No interrupt map, check for an interrupt parent */