gb_connection_hd_find() looks up a connection on a host device by its host-side CPort id. Callers that only know the remote end of a connection (the interface id and the CPort id) have no way to find it.
Add gb_connection_hd_find_by_intf(), which walks the host device's connection list and returns a reference-counted pointer to the matching connection, or NULL if there is none. The caller is responsible for dropping the reference with gb_connection_put(). The first user is gb-softsvc driver, added later in this series.
Signed-off-by: Ayush Singh ayush@beagleboard.org --- drivers/greybus/connection.c | 23 +++++++++++++++++++++++ include/linux/greybus/connection.h | 3 +++ 2 files changed, 26 insertions(+)
diff --git a/drivers/greybus/connection.c b/drivers/greybus/connection.c index f8fda22bc466..dc9eb49a69bc 100644 --- a/drivers/greybus/connection.c +++ b/drivers/greybus/connection.c @@ -71,6 +71,29 @@ gb_connection_hd_find(struct gb_host_device *hd, u16 cport_id) return connection; }
+struct gb_connection *gb_connection_hd_find_by_intf(struct gb_host_device *hd, + u8 intf_id, u16 intf_cport) +{ + struct gb_connection *connection; + unsigned long flags; + + spin_lock_irqsave(&gb_connections_lock, flags); + list_for_each_entry(connection, &hd->connections, hd_links) { + if (connection->intf && + connection->intf->interface_id == intf_id && + connection->intf_cport_id == intf_cport) { + gb_connection_get(connection); + goto found; + } + } + connection = NULL; +found: + spin_unlock_irqrestore(&gb_connections_lock, flags); + + return connection; +} +EXPORT_SYMBOL_GPL(gb_connection_hd_find_by_intf); + /* * Callback from the host driver to let us know that data has been * received on the bundle. diff --git a/include/linux/greybus/connection.h b/include/linux/greybus/connection.h index b53aad2270d6..589721d46015 100644 --- a/include/linux/greybus/connection.h +++ b/include/linux/greybus/connection.h @@ -131,4 +131,7 @@ static inline void gb_connection_set_data(struct gb_connection *connection, void gb_connection_get(struct gb_connection *connection); void gb_connection_put(struct gb_connection *connection);
+struct gb_connection *gb_connection_hd_find_by_intf(struct gb_host_device *hd, + u8 intf_id, u16 intf_cport); + #endif /* __CONNECTION_H */