[PATCH v4 06/15] staging: gpib: fluke: Handle gpib_register_driver() errors

[Nihar Chaithanya <niharchaithanya@gmail.com>]

The function gpib_register_driver() can fail, resulting in a
semi-registered module and does not return an error value if it
fails.

Unregister the previous platform driver and gpib registering
functions if subsequent gpib_register_driver() fail and return the
error value.

Signed-off-by: Nihar Chaithanya <niharchaithanya@gmail.com>
---
 drivers/staging/gpib/eastwood/fluke_gpib.c | 28 ++++++++++++++++------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/gpib/eastwood/fluke_gpib.c b/drivers/staging/gpib/eastwood/fluke_gpib.c
index 3f938ab0c84d..2efc0226ec2b 100644
--- a/drivers/staging/gpib/eastwood/fluke_gpib.c
+++ b/drivers/staging/gpib/eastwood/fluke_gpib.c
@@ -1154,17 +1154,31 @@ static int __init fluke_init_module(void)
 	int result;
 
 	result = platform_driver_register(&fluke_gpib_platform_driver);
-	if (result) {
-		pr_err("fluke_gpib: platform_driver_register failed!\n");
+	if (result)
 		return result;
-	}
 
-	gpib_register_driver(&fluke_unaccel_interface, THIS_MODULE);
-	gpib_register_driver(&fluke_hybrid_interface, THIS_MODULE);
-	gpib_register_driver(&fluke_interface, THIS_MODULE);
+	result = gpib_register_driver(&fluke_unaccel_interface, THIS_MODULE);
+	if (result)
+		goto err_unaccel;
+
+	result = gpib_register_driver(&fluke_hybrid_interface, THIS_MODULE);
+	if (result)
+		goto err_hybrid;
+
+	result = gpib_register_driver(&fluke_interface, THIS_MODULE);
+	if (result)
+		goto err_interface;
 
-	pr_info("fluke_gpib\n");
 	return 0;
+
+err_interface:
+	gpib_unregister_driver(&fluke_hybrid_interface);
+err_hybrid:
+	gpib_unregister_driver(&fluke_unaccel_interface);
+err_unaccel:
+	platform_driver_unregister(&fluke_gpib_platform_driver);
+
+	return result;
 }
 
 static void __exit fluke_exit_module(void)
-- 
2.34.1