[PATCH v2 1/8] of_path: of_find_path() factor out device detection logic into separate function

[Trent Piepho]

On Tue, 2015-10-20 at 10:39 +0200, Marc Kleine-Budde wrote:
> This patch factors out the device detection logic into separate function, so
> that it can be used from another function.

The use of device-path = &mmc0, "partname:0"; breaks because it tries to
get the "partname:0" string by looking at "device-path" in &mmc0.  It
should be looking for device-path in the original node.
 
> +int __of_find_path(struct device_node *node, const char *propname, char **outpath, unsigned flags)
> +{

> +	while (propname) {
> +		ret = of_property_read_string_index(node, propname, i++, &str);

Here 'node' is the device node pointed to by propname in the node
originally passed to of_find_path().  I.e., &mmc0.


>  int of_find_path(struct device_node *node, const char *propname, char **outpath, unsigned flags)
>  {
> -
> -	while (1) {
> -		ret = of_property_read_string_index(node, propname, i++, &str);
> -		if (ret)

But here 'node' is the node that is passed to of_find_path.

> +	return __of_find_path(rnode, propname, outpath, flags);

Because here you pass rnode, not node, to __of_find_path() and then use
it where the original code used node.