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Linux/arch/powerpc/platforms/pseries/of_helpers.c

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  1 #include <linux/string.h>
  2 #include <linux/err.h>
  3 #include <linux/slab.h>
  4 #include <linux/of.h>
  5 
  6 #include "of_helpers.h"
  7 
  8 /**
  9  * pseries_of_derive_parent - basically like dirname(1)
 10  * @path:  the full_name of a node to be added to the tree
 11  *
 12  * Returns the node which should be the parent of the node
 13  * described by path.  E.g., for path = "/foo/bar", returns
 14  * the node with full_name = "/foo".
 15  */
 16 struct device_node *pseries_of_derive_parent(const char *path)
 17 {
 18         struct device_node *parent;
 19         char *parent_path = "/";
 20         const char *tail;
 21 
 22         /* We do not want the trailing '/' character */
 23         tail = kbasename(path) - 1;
 24 
 25         /* reject if path is "/" */
 26         if (!strcmp(path, "/"))
 27                 return ERR_PTR(-EINVAL);
 28 
 29         if (tail > path) {
 30                 parent_path = kstrndup(path, tail - path, GFP_KERNEL);
 31                 if (!parent_path)
 32                         return ERR_PTR(-ENOMEM);
 33         }
 34         parent = of_find_node_by_path(parent_path);
 35         if (strcmp(parent_path, "/"))
 36                 kfree(parent_path);
 37         return parent ? parent : ERR_PTR(-EINVAL);
 38 }
 39 

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