[PATCH v4 10/15] staging: gpib: hp_82341: Handle gpib_register_driver() errors

[Nihar Chaithanya]

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

Return the error value if the first gpib_register_driver() fails
and if the second gpib_register_driver() fails unregister the first
gpib_register_driver() and return the error value.

Signed-off-by: Nihar Chaithanya <niharchaithanya@xxxxxxxxx>
---
 drivers/staging/gpib/hp_82341/hp_82341.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gpib/hp_82341/hp_82341.c b/drivers/staging/gpib/hp_82341/hp_82341.c
index 8ad1c885a9fb..daf5f6e02bd5 100644
--- a/drivers/staging/gpib/hp_82341/hp_82341.c
+++ b/drivers/staging/gpib/hp_82341/hp_82341.c
@@ -807,9 +807,17 @@ MODULE_DEVICE_TABLE(pnp, hp_82341_pnp_table);
 
 static int __init hp_82341_init_module(void)
 {
-	gpib_register_driver(&hp_82341_unaccel_interface, THIS_MODULE);
-	gpib_register_driver(&hp_82341_interface, THIS_MODULE);
-	return 0;
+	int ret = 0;
+
+	ret = gpib_register_driver(&hp_82341_unaccel_interface, THIS_MODULE);
+	if (ret)
+		return ret;
+
+	ret = gpib_register_driver(&hp_82341_interface, THIS_MODULE);
+	if (ret)
+		gpib_unregister_driver(&hp_82341_unaccel_interface);
+
+	return ret;
 }
 
 static void __exit hp_82341_exit_module(void)
-- 
2.34.1