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of: of_parse_phandles_with_args() learns to differentiate 'hole' cells 

Given this list (contains three gpio specifiers, one of which is a hole):

gpios = <&phandle1 1 2 3
         0 /* a hole */
         &phandle2 4 5 6>;

of_parse_phandles_with_args() would report -ENOENT for the `hole'
specifier item, the same error value is used to report the end of the
list, for example.

Sometimes we want to differentiate holes from real errors -- for
example when we want to count all the [syntax correct] specifiers.

With this patch of_parse_phandles_with_args() will report -EEXITS when
somebody requested to parse a hole.

Also, make the out_{node,args} arguments optional, when counting we
don't really need the out values.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Anton Vorontsov 2008-12-05 08:15:46 +00:00 committed by Paul Mackerras
parent c1bb7c6d04
commit 7736a3db98
1 changed files with 16 additions and 6 deletions
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22
drivers/of/base.c
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@ -499,8 +499,8 @@ EXPORT_SYMBOL_GPL(of_modalias_node);
* @list_name: property name that contains a list
* @cells_name: property name that specifies phandles' arguments count
* @index: index of a phandle to parse out
* @out_node: pointer to device_node struct pointer (will be filled)
* @out_args: pointer to arguments pointer (will be filled)
* @out_node: optional pointer to device_node struct pointer (will be filled)
* @out_args: optional pointer to arguments pointer (will be filled)
*
* This function is useful to parse lists of phandles and their arguments.
* Returns 0 on success and fills out_node and out_args, on error returns
@ -534,7 +534,7 @@ int of_parse_phandles_with_args(struct device_node *np, const char *list_name,
int size;
int cur_index = 0;
struct device_node *node = NULL;
const void *args;
const void *args = NULL;
list = of_get_property(np, list_name, &size);
if (!list) {
@ -580,16 +580,26 @@ int of_parse_phandles_with_args(struct device_node *np, const char *list_name,
of_node_put(node);
node = NULL;
args = NULL;
cur_index++;
}
if (!node) {
ret = -ENOENT;
/*
* args w/o node indicates that the loop above has stopped at
* the 'hole' cell. Report this differently.
*/
if (args)
ret = -EEXIST;
else
ret = -ENOENT;
goto err0;
}
*out_node = node;
*out_args = args;
if (out_node)
*out_node = node;
if (out_args)
*out_args = args;
return 0;
err1: