software node: Let args be NULL in software_node_get_reference_args

fwnode_get_property_reference_args() may not be called with args argument
NULL and while OF already supports this. Add the missing NULL check.

The purpose is to be able to count the references.

Fixes: b06184acf751 ("software node: Add software_node_get_reference_args()")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20231109101010.1329587-3-sakari.ailus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c
index f7c4317b2ccfe930d35980b9ee77cc7d8dc4174c..36512fb75a201c1a1ab5aa68b694667b56b96036 100644 (file)
--- a/drivers/base/swnode.c
+++ b/drivers/base/swnode.c
@@ -541,6 +541,9 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode,
        if (nargs > NR_FWNODE_REFERENCE_ARGS)
                return -EINVAL;
 
+       if (!args)
+               return 0;
+
        args->fwnode = software_node_get(refnode);
        args->nargs = nargs;