[Xen-devel] [PATCH 2/8] device tree: correctly ignore unit-address when matching nodes by name

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

When matching node by their name, correctly ignore the unit address
(@...) part of the name.  Previously, a "memory-controller" node would
be incorrectly matched as a "memory" node.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 xen/common/device_tree.c |   19 +++++++++++++++----
 1 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index d50cb9c..e5df748 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -24,6 +24,20 @@
 struct dt_early_info __initdata early_info;
 void *device_tree_flattened;
 
+static bool_t __init node_matches(const void *fdt, int node, const char *match)
+{
+    const char *name;
+    size_t len;
+
+    name = fdt_get_name(fdt, node, NULL);
+    len = strlen(match);
+
+    /* Match both "match" and "match@..." patterns but not
+       "match-foo". */
+    return strncmp(name, match, len) == 0
+        && (name[len] == '@' || name[len] == '\0');
+}
+
 static void __init get_val(const u32 **cell, u32 cells, u64 *val)
 {
     *val = 0;
@@ -93,13 +107,10 @@ static void __init early_scan(const void *fdt)
 {
     int node;
     int depth;
-    const char *name;
     u32 address_cells[MAX_DEPTH];
     u32 size_cells[MAX_DEPTH];
 
     for (node = 0; depth >= 0; node = fdt_next_node(fdt, node, &depth)) {
-        name = fdt_get_name(fdt, node, NULL);
-
         if (depth >= MAX_DEPTH) {
             early_printk("fdt: node '%s': nested too deep\n",
                          fdt_get_name(fdt, node, NULL));
@@ -109,7 +120,7 @@ static void __init early_scan(const void *fdt)
         address_cells[depth] = prop_by_name_u32(fdt, node, "#address-cells");
         size_cells[depth] = prop_by_name_u32(fdt, node, "#size-cells");
 
-        if (strncmp(name, "memory", 6) == 0)
+        if (node_matches(fdt, node, "memory"))
             process_memory_node(fdt, node, address_cells[depth-1], 
size_cells[depth-1]);
     }
 }
-- 
1.7.2.5


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