[PATCH v6 14/15] staging: gpib: pc2: 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 gpib registering functions if subsequent
gpib_register_driver() fail and return the error value. Add pr_err()
statements indicating the fail and error value.

Signed-off-by: Nihar Chaithanya <niharchaithanya@gmail.com>
---
 drivers/staging/gpib/pc2/pc2_gpib.c | 38 ++++++++++++++++++++++++++---
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/gpib/pc2/pc2_gpib.c b/drivers/staging/gpib/pc2/pc2_gpib.c
index 7b3b34f47341..a9aae563f60a 100644
--- a/drivers/staging/gpib/pc2/pc2_gpib.c
+++ b/drivers/staging/gpib/pc2/pc2_gpib.c
@@ -635,12 +635,42 @@ void pc2_2a_detach(gpib_board_t *board)
 
 static int __init pc2_init_module(void)
 {
-	gpib_register_driver(&pc2_interface, THIS_MODULE);
-	gpib_register_driver(&pc2a_interface, THIS_MODULE);
-	gpib_register_driver(&pc2a_cb7210_interface, THIS_MODULE);
-	gpib_register_driver(&pc2_2a_interface, THIS_MODULE);
+	int ret;
+
+	ret = gpib_register_driver(&pc2_interface, THIS_MODULE);
+	if (ret) {
+		pr_err("pc2_gpib: gpib_register_driver failed: error = %d\n", ret);
+		return ret;
+	}
+
+	ret = gpib_register_driver(&pc2a_interface, THIS_MODULE);
+	if (ret) {
+		pr_err("pc2_gpib: gpib_register_driver failed: error = %d\n", ret);
+		goto err_pc2a;
+	}
+
+	ret = gpib_register_driver(&pc2a_cb7210_interface, THIS_MODULE);
+	if (ret) {
+		pr_err("pc2_gpib: gpib_register_driver failed: error = %d\n", ret);
+		goto err_cb7210;
+	}
+
+	ret = gpib_register_driver(&pc2_2a_interface, THIS_MODULE);
+	if (ret) {
+		pr_err("pc2_gpib: gpib_register_driver failed: error = %d\n", ret);
+		goto err_pc2_2a;
+	}
 
 	return 0;
+
+err_pc2_2a:
+	gpib_unregister_driver(&pc2a_cb7210_interface);
+err_cb7210:
+	gpib_unregister_driver(&pc2a_interface);
+err_pc2a:
+	gpib_unregister_driver(&pc2_interface);
+
+	return ret;
 }
 
 static void __exit pc2_exit_module(void)
-- 
2.34.1