diff options
| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2008-12-05 11:15:46 +0300 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2008-12-21 06:21:14 +0300 |
| commit | 7736a3db98bed028d0e5235f8958a730acfd822e (patch) | |
| tree | 27ab46e431b71294c24dbbf721bdbc581f977f14 | |
| parent | c1bb7c6d04ebdf48998649100c5267a9139debf5 (diff) | |
| download | linux-7736a3db98bed028d0e5235f8958a730acfd822e.tar.xz | |
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>
| -rw-r--r-- | drivers/of/base.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index cf04d4dd4a53..cd17092b82bd 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -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 @@ next: 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: |