[XEN][PATCH v5 02/17] common/device_tree: change __unflatten_device_tree()

[Vikram Garhwal <vikram.garhwal@amd.com>]

Following changes are done to __unflatten_device_tree():
    1. __unflatten_device_tree() is renamed to unflatten_device_tree().
    2. Remove static function type.
    3. Add handling of memory allocation. This will be useful in dynamic node
        programming when we unflatten the dt during runtime memory allocation
        can fail.

Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
---
 xen/common/device_tree.c      | 10 ++++++----
 xen/include/xen/device_tree.h |  5 +++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/xen/common/device_tree.c b/xen/common/device_tree.c
index aed38ff63c..bf847b2584 100644
--- a/xen/common/device_tree.c
+++ b/xen/common/device_tree.c
@@ -2047,7 +2047,7 @@ static unsigned long unflatten_dt_node(const void *fdt,
 }
 
 /**
- * __unflatten_device_tree - create tree of device_nodes from flat blob
+ * unflatten_device_tree - create tree of device_nodes from flat blob
  *
  * unflattens a device-tree, creating the
  * tree of struct device_node. It also fills the "name" and "type"
@@ -2056,8 +2056,7 @@ static unsigned long unflatten_dt_node(const void *fdt,
  * @fdt: The fdt to expand
  * @mynodes: The device_node tree created by the call
  */
-static void __unflatten_device_tree(const void *fdt,
-                                    struct dt_device_node **mynodes)
+void unflatten_device_tree(const void *fdt, struct dt_device_node **mynodes)
 {
     unsigned long start, mem, size;
     struct dt_device_node **allnextp = mynodes;
@@ -2079,6 +2078,9 @@ static void __unflatten_device_tree(const void *fdt,
     /* Allocate memory for the expanded device tree */
     mem = (unsigned long)_xmalloc (size + 4, __alignof__(struct dt_device_node));
 
+    if ( !mem )
+        panic("Cannot allocate memory for unflatten device tree\n");
+
     ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
 
     dt_dprintk("  unflattening %lx...\n", mem);
@@ -2179,7 +2181,7 @@ dt_find_interrupt_controller(const struct dt_device_match *matches)
 
 void __init dt_unflatten_host_device_tree(void)
 {
-    __unflatten_device_tree(device_tree_flattened, &dt_host);
+    unflatten_device_tree(device_tree_flattened, &dt_host);
     dt_alias_scan();
 }
 
diff --git a/xen/include/xen/device_tree.h b/xen/include/xen/device_tree.h
index 19a74909ce..58ac12abe3 100644
--- a/xen/include/xen/device_tree.h
+++ b/xen/include/xen/device_tree.h
@@ -178,6 +178,11 @@ int device_tree_for_each_node(const void *fdt, int node,
  */
 void dt_unflatten_host_device_tree(void);
 
+/**
+ * unflatten any device tree.
+ */
+void unflatten_device_tree(const void *fdt, struct dt_device_node **mynodes);
+
 /**
  * IRQ translation callback
  * TODO: For the moment we assume that we only have ONE
-- 
2.17.1