[PATCH] sap: Improve error messages

["Pali Rohár" <pali@kernel.org>]

When bluetoohd daemon is starting, it prints following error messages:

bluetoothd[19117]: profiles/sap/server.c:sap_server_register() Sap driver initialization failed.
bluetoothd[19117]: sap-server: Operation not permitted (1)

Initialization is failing because sap server is enabled only when
bluetoothd daemon is started with --experimental option.

And "Operation not permitted" is result of returning error code -1.

This patch improves error messages. When --experimental option is not used
then bluetoothd prints more explaining error message. And in case function
sap_init() fails then -EOPNOTSUPP "Operation not supported" is returned
instead of -EPERM (-1).
---
 profiles/sap/server.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/profiles/sap/server.c b/profiles/sap/server.c
index 5de682a33..99ff80297 100644
--- a/profiles/sap/server.c
+++ b/profiles/sap/server.c
@@ -1353,9 +1353,14 @@ int sap_server_register(struct btd_adapter *adapter)
 	GIOChannel *io;
 	struct sap_server *server;
 
+	if (!(g_dbus_get_flags() & G_DBUS_FLAG_ENABLE_EXPERIMENTAL)) {
+		error("Sap driver is disabled without --experimental option");
+		return -EOPNOTSUPP;
+	}
+
 	if (sap_init() < 0) {
 		error("Sap driver initialization failed.");
-		return -1;
+		return -EOPNOTSUPP;
 	}
 
 	record = create_sap_record(SAP_SERVER_CHANNEL);
-- 
2.20.1