linux-kernel - [PATCH] staging: gpib: cb7210: Add error handling

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Message-Id: <20241221022632.20931-1-niharchaithanya@gmail.com>
Date: Sat, 21 Dec 2024 07:56:33 +0530
From: Nihar Chaithanya <niharchaithanya@...il.com>
To: dpenkler@...il.com,
	gregkh@...uxfoundation.org,
	dan.carpenter@...aro.org,
	niharchaithanya@...il.com,
	roheetchavan@...il.com,
	arnd@...db.de,
	linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Cc: skhan@...uxfoundation.org
Subject: [PATCH] staging: gpib: cb7210: Add error handling

The if condition in cb7210_init_module() would always fail as
the value of err is constantly 0.
Add error handling to cb_pcmcia_init_module() where it returns
appropriate error code if pcmcia_register_driver() fails.

This issue was reported by Coverity Scan.
Report:

CID 1635894: (#1 of 1): 'Constant' variable guards dead code (DEADCODE)
dead_error_line: Execution cannot reach this statement: return -1;.

Signed-off-by: Nihar Chaithanya <niharchaithanya@...il.com>
---
 drivers/staging/gpib/cb7210/cb7210.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/gpib/cb7210/cb7210.c b/drivers/staging/gpib/cb7210/cb7210.c
index 63df7f3eb3f3..b2f6ad70ccaf 100644
--- a/drivers/staging/gpib/cb7210/cb7210.c
+++ b/drivers/staging/gpib/cb7210/cb7210.c
@@ -1353,7 +1353,11 @@ static struct pcmcia_driver cb_gpib_cs_driver = {
 
 int cb_pcmcia_init_module(void)
 {
-	pcmcia_register_driver(&cb_gpib_cs_driver);
+	int ret;
+
+	ret = pcmcia_register_driver(&cb_gpib_cs_driver);
+	if (ret < 0)
+		return ret;
 	return 0;
 }
 
@@ -1528,9 +1532,10 @@ static int __init cb7210_init_module(void)
 	gpib_register_driver(&cb_pcmcia_unaccel_interface, THIS_MODULE);
 	err += cb_pcmcia_init_module();
 #endif
-	if (err)
+	if (err) {
+		pr_err("cb7210: registering PCMCIA driver with the bus core failed\n");
 		return -1;
-
+	}
 	return 0;
 }
 
-- 
2.34.1