linux-kernel - [PATCH v4 10/15] staging: gpib: hp_82341: Handle gpib_register

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Message-Id: <20241226193637.241049-11-niharchaithanya@gmail.com>
Date: Fri, 27 Dec 2024 01:06:34 +0530
From: Nihar Chaithanya <niharchaithanya@...il.com>
To: dpenkler@...il.com,
	gregkh@...uxfoundation.org
Cc: dan.carpenter@...aro.org,
	skhan@...uxfoundation.org,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Nihar Chaithanya <niharchaithanya@...il.com>
Subject: [PATCH v4 10/15] staging: gpib: hp_82341: Handle gpib_register_driver() errors

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@...il.com>
---
 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