target/linux/brcm63xx/patches-3.14/001-of-Create-unlocked-version-of-for_each_child_of_node.patch

   1 From 0d0e02d605c5696a5076510f564fefe659127aa4 Mon Sep 17 00:00:00 2001
   2 From: Grant Likely <grant.likely@linaro.org>
   3 Date: Thu, 22 May 2014 01:04:17 +0900
   4 Subject: [PATCH] of: Create unlocked version of for_each_child_of_node()
   5
   6 When iterating over nodes, sometimes it needs to be done when the DT
   7 lock is already held. This patch makes an unlocked version of the
   8 for_each_child_of_node() macro.
   9
  10 Signed-off-by: Grant Likely <grant.likely@linaro.org>
  11 ---
  12  drivers/of/base.c | 22 +++++++++++++++++-----
  13  1 file changed, 17 insertions(+), 5 deletions(-)
  14
  15 --- a/drivers/of/base.c
  16 +++ b/drivers/of/base.c
  17 @@ -545,6 +545,22 @@ struct device_node *of_get_next_parent(s
  18  }
  19  EXPORT_SYMBOL(of_get_next_parent);
  20
  21 +static struct device_node *__of_get_next_child(const struct device_node *node,
  22 +                                               struct device_node *prev)
  23 +{
  24 +       struct device_node *next;
  25 +
  26 +       next = prev ? prev->sibling : node->child;
  27 +       for (; next; next = next->sibling)
  28 +               if (of_node_get(next))
  29 +                       break;
  30 +       of_node_put(prev);
  31 +       return next;
  32 +}
  33 +#define __for_each_child_of_node(parent, child) \
  34 +       for (child = __of_get_next_child(parent, NULL); child != NULL; \
  35 +            child = __of_get_next_child(parent, child))
  36 +
  37  /**
  38   *     of_get_next_child - Iterate a node childs
  39   *     @node:  parent node
  40 @@ -560,11 +576,7 @@ struct device_node *of_get_next_child(co
  41         unsigned long flags;
  42
  43         raw_spin_lock_irqsave(&devtree_lock, flags);
  44 -       next = prev ? prev->sibling : node->child;
  45 -       for (; next; next = next->sibling)
  46 -               if (of_node_get(next))
  47 -                       break;
  48 -       of_node_put(prev);
  49 +       next = __of_get_next_child(node, prev);
  50         raw_spin_unlock_irqrestore(&devtree_lock, flags);
  51         return next;
  52  }