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dsa: Make use of the list of tag drivers

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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>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

v2:
Make tag_driver_register void

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrew Lunn 2019-04-28 19:37:20 +02:00 committed by David S. Miller
parent 4dad81ee14
commit 3675617531
1 changed files with 34 additions and 5 deletions
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39
net/dsa/dsa.c
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@ -125,20 +125,49 @@ 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)
{
struct dsa_tag_driver *dsa_tag_driver;
const 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(dsa_tag_driver, &dsa_tag_drivers_list, list) {
ops = dsa_tag_driver->ops;
if (ops->proto == tag_protocol) {
found = true;
break;
}
}
if (found) {
if (!try_module_get(dsa_tag_driver->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)
{
struct dsa_tag_driver *dsa_tag_driver;
mutex_lock(&dsa_tag_drivers_lock);
list_for_each_entry(dsa_tag_driver, &dsa_tag_drivers_list, list) {
if (dsa_tag_driver->ops == ops) {
module_put(dsa_tag_driver->owner);
break;
}
}
mutex_unlock(&dsa_tag_drivers_lock);
}
static int dev_is_class(struct device *dev, void *class)