@@ -129,20 +129,38 @@ const char *dsa_tag_protocol_to_str(const struct dsa_device_ops *ops)
const struct dsa_device_ops *dsa_tag_driver_get(int tag_protocol)
{
- const struct dsa_device_ops *ops;
+ struct dsa_device_ops *ops;
+ char module_name[128];
+ bool found = false;
- if (tag_protocol >= DSA_TAG_LAST)
- return ERR_PTR(-EINVAL);
- ops = dsa_device_ops[tag_protocol];
+ snprintf(module_name, 127, "%s%d", DSA_TAG_DRIVER_ALIAS,
+ tag_protocol);
- if (!ops)
- return ERR_PTR(-ENOPROTOOPT);
+ request_module(module_name);
+
+ mutex_lock(&dsa_tag_drivers_lock);
+ list_for_each_entry(ops, &dsa_tag_drivers_list, list) {
+ if (ops->proto == tag_protocol) {
+ found = true;
+ break;
+ }
+ }
+
+ if (found) {
+ if (!try_module_get(ops->owner))
+ ops = ERR_PTR(-ENOPROTOOPT);
+ } else {
+ ops = ERR_PTR(-ENOPROTOOPT);
+ }
+
+ mutex_unlock(&dsa_tag_drivers_lock);
return ops;
}
void dsa_tag_driver_put(const struct dsa_device_ops *ops)
{
+ module_put(ops->owner);
}
static int dev_is_class(struct device *dev, void *class)
Implement the _get and _put functions to make use of the list of tag drivers. Also, trigger the loading of the module, based on the alias information. The _get function takes a reference on the tag driver, so it cannot be unloaded, and the _put function releases the reference. Signed-off-by: Andrew Lunn <andrew@lunn.ch> --- net/dsa/dsa.c | 30 ++++++++++++++++++++++++------ 1 file changed, 24 insertions(+), 6 deletions(-)