greybus: connection: fail to bind if connection init fails

gb_connection_init() can fail and will return proper error code in that
case, but the caller is ignoring it currently.

Fix that by properly handling errors returned from gb_connection_init()
and propagating them to callers of gb_connection_bind_protocol().

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>

diff --git a/drivers/staging/greybus/connection.c b/drivers/staging/greybus/connection.c
index 2987053..d0642bc 100644 (file)
--- a/drivers/staging/greybus/connection.c
+++ b/drivers/staging/greybus/connection.c
@@ -451,19 +451,20 @@ void gb_hd_connections_exit(struct greybus_host_device *hd)
                gb_connection_destroy(connection);
 }
 
-void gb_connection_bind_protocol(struct gb_connection *connection)
+int gb_connection_bind_protocol(struct gb_connection *connection)
 {
        struct gb_protocol *protocol;
+       int ret;
 
        /* If we already have a protocol bound here, just return */
        if (connection->protocol)
-               return;
+               return 0;
 
        protocol = gb_protocol_get(connection->protocol_id,
                                   connection->major,
                                   connection->minor);
        if (!protocol)
-               return;
+               return 0;
        connection->protocol = protocol;
 
        /*
@@ -472,6 +473,14 @@ void gb_connection_bind_protocol(struct gb_connection *connection)
         */
        if ((!connection->bundle &&
             connection->hd_cport_id == GB_SVC_CPORT_ID) ||
-           connection->bundle->intf->device_id != GB_DEVICE_ID_BAD)
-               gb_connection_init(connection);
+           connection->bundle->intf->device_id != GB_DEVICE_ID_BAD) {
+               ret = gb_connection_init(connection);
+               if (ret) {
+                       gb_protocol_put(protocol);
+                       connection->protocol = NULL;
+                       return ret;
+               }
+       }
+
+       return 0;
 }

diff --git a/drivers/staging/greybus/connection.h b/drivers/staging/greybus/connection.h
index 0b442fe..e3ae01d 100644 (file)
--- a/drivers/staging/greybus/connection.h
+++ b/drivers/staging/greybus/connection.h
@@ -68,6 +68,6 @@ void gb_connection_push_timestamp(struct gb_connection *connection);
 int gb_connection_pop_timestamp(struct gb_connection *connection,
                                struct timeval *tv);
 
-void gb_connection_bind_protocol(struct gb_connection *connection);
+int gb_connection_bind_protocol(struct gb_connection *connection);
 
 #endif /* __CONNECTION_H */