of: irq: use of_property_read_u32()

The DT interrupt parsing code predates of_property_read_u32(), so it has to
basically open-code it. Using the modern DT API saves several LoCs and also
adds some prop sanity checks as a bonus...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Rob Herring <robh@kernel.org>

diff --git a/drivers/of/irq.c b/drivers/of/irq.c
index 1f6ef23..abbd252 100644 (file)
--- a/drivers/of/irq.c
+++ b/drivers/of/irq.c
@@ -59,20 +59,19 @@ EXPORT_SYMBOL_GPL(irq_of_parse_and_map);
 struct device_node *of_irq_find_parent(struct device_node *child)
 {
        struct device_node *p;
-       const __be32 *parp;
+       phandle parent;
 
        if (!of_node_get(child))
                return NULL;
 
        do {
-               parp = of_get_property(child, "interrupt-parent", NULL);
-               if (parp == NULL)
+               if (of_property_read_u32(child, "interrupt-parent", &parent)) {
                        p = of_get_parent(child);
-               else {
+               } else  {
                        if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
                                p = of_node_get(of_irq_dflt_pic);
                        else
-                               p = of_find_node_by_phandle(be32_to_cpup(parp));
+                               p = of_find_node_by_phandle(parent);
                }
                of_node_put(child);
                child = p;
@@ -117,11 +116,8 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
         * is none, we are nice and just walk up the tree
         */
        do {
-               tmp = of_get_property(ipar, "#interrupt-cells", NULL);
-               if (tmp != NULL) {
-                       intsize = be32_to_cpu(*tmp);
+               if (!of_property_read_u32(ipar, "#interrupt-cells", &intsize))
                        break;
-               }
                tnode = ipar;
                ipar = of_irq_find_parent(ipar);
                of_node_put(tnode);
@@ -228,14 +224,14 @@ int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq)
                        /* Get #interrupt-cells and #address-cells of new
                         * parent
                         */
-                       tmp = of_get_property(newpar, "#interrupt-cells", NULL);
-                       if (tmp == NULL) {
+                       if (of_property_read_u32(newpar, "#interrupt-cells",
+                                                &newintsize)) {
                                pr_debug(" -> parent lacks #interrupt-cells!\n");
                                goto fail;
                        }
-                       newintsize = be32_to_cpu(*tmp);
-                       tmp = of_get_property(newpar, "#address-cells", NULL);
-                       newaddrsize = (tmp == NULL) ? 0 : be32_to_cpu(*tmp);
+                       if (of_property_read_u32(newpar, "#address-cells",
+                                                &newaddrsize))
+                               newaddrsize = 0;
 
                        pr_debug(" -> newintsize=%d, newaddrsize=%d\n",
                            newintsize, newaddrsize);
@@ -296,7 +292,7 @@ EXPORT_SYMBOL_GPL(of_irq_parse_raw);
 int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_args *out_irq)
 {
        struct device_node *p;
-       const __be32 *intspec, *tmp, *addr;
+       const __be32 *intspec, *addr;
        u32 intsize, intlen;
        int i, res;
 
@@ -330,12 +326,10 @@ int of_irq_parse_one(struct device_node *device, int index, struct of_phandle_ar
                return -EINVAL;
 
        /* Get size of interrupt specifier */
-       tmp = of_get_property(p, "#interrupt-cells", NULL);
-       if (tmp == NULL) {
+       if (of_property_read_u32(p, "#interrupt-cells", &intsize)) {
                res = -EINVAL;
                goto out;
        }
-       intsize = be32_to_cpu(*tmp);
 
        pr_debug(" intsize=%d intlen=%d\n", intsize, intlen);