[PATCH v5 03/15] staging: gpib: agilent_82357a: Handle gpib_register_driver() errors

[Nihar Chaithanya <niharchaithanya@gmail.com>]

The usb_register() function can fail and returns an error value which
is not returned. The function gpib_register_driver() can also fail
which can result in semi-registered module.

In case gpib_register_driver() fails unregister the previous usb driver
registering function. Return the error value if gpib_register_driver()
or usb_register() functions fail.

Signed-off-by: Nihar Chaithanya <niharchaithanya@gmail.com>
---
 .../gpib/agilent_82357a/agilent_82357a.c       | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gpib/agilent_82357a/agilent_82357a.c b/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
index bf05fb4a736b..4bdf6ce54622 100644
--- a/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
+++ b/drivers/staging/gpib/agilent_82357a/agilent_82357a.c
@@ -1691,13 +1691,25 @@ static struct usb_driver agilent_82357a_bus_driver = {
 static int __init agilent_82357a_init_module(void)
 {
 	int i;
+	int ret;
 
-	pr_info("agilent_82357a_gpib driver loading");
 	for (i = 0; i < MAX_NUM_82357A_INTERFACES; ++i)
 		agilent_82357a_driver_interfaces[i] = NULL;
-	usb_register(&agilent_82357a_bus_driver);
-	gpib_register_driver(&agilent_82357a_gpib_interface, THIS_MODULE);
 
+	ret = usb_register(&agilent_82357a_bus_driver);
+	if (ret) {
+		pr_err("agilent_82357a: usb_register failed: error = %d\n", ret);
+		return ret;
+	}
+
+	ret = gpib_register_driver(&agilent_82357a_gpib_interface, THIS_MODULE);
+	if (ret) {
+		pr_err("agilent_82357a: gpib_register_driver failed!\n");
+		usb_deregister(&agilent_82357a_bus_driver);
+		return ret;
+	}
+
+	pr_info("agilent_82357a: module init is complete\n");
 	return 0;
 }
 
-- 
2.34.1