linux-kernel - [PATCH v5 04/15] staging: gpib: cb7210: Handle gpib_register

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Message-Id: <20241228060800.107653-5-niharchaithanya@gmail.com>
Date: Sat, 28 Dec 2024 11:37:52 +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 v5 04/15] staging: gpib: cb7210: Handle gpib_register_driver() errors

The function cb_pcmcia_init_module() can be replaced by calling
pcmcia_register_driver() directly. The error value from this
function is not returned and the previous registering functions
are not unregistered.

The function gpib_register_driver() can fail and similar to
pcmcia_register_driver() function failing, the previous registering
functions are not unregistered.

Replace cb_pcmcia_init_module() with pcmcia_register_driver().
Unregister the gpib and pci register functions if the subsequent
gpib or pcmcia register functions fail and return the error value.

Signed-off-by: Nihar Chaithanya <niharchaithanya@...il.com>
---
 drivers/staging/gpib/cb7210/cb7210.c | 99 ++++++++++++++++++++--------
 1 file changed, 73 insertions(+), 26 deletions(-)

diff --git a/drivers/staging/gpib/cb7210/cb7210.c b/drivers/staging/gpib/cb7210/cb7210.c
index 63df7f3eb3f3..99041ee007bb 100644
--- a/drivers/staging/gpib/cb7210/cb7210.c
+++ b/drivers/staging/gpib/cb7210/cb7210.c
@@ -1351,12 +1351,6 @@ static struct pcmcia_driver cb_gpib_cs_driver = {
 	.resume		= cb_gpib_resume,
 };
 
-int cb_pcmcia_init_module(void)
-{
-	pcmcia_register_driver(&cb_gpib_cs_driver);
-	return 0;
-}
-
 void cb_pcmcia_cleanup_module(void)
 {
 	DEBUG(0, "cb_gpib_cs: unloading\n");
@@ -1506,32 +1500,85 @@ void cb_pcmcia_detach(gpib_board_t *board)
 
 static int __init cb7210_init_module(void)
 {
-	int err = 0;
-	int result;
+	int ret;
 
-	result = pci_register_driver(&cb7210_pci_driver);
-	if (result) {
-		pr_err("cb7210: pci_driver_register failed!\n");
-		return result;
+	ret = pci_register_driver(&cb7210_pci_driver);
+	if (ret) {
+		pr_err("cb7210: pci_driver_register failed: error = %d\n", ret);
+		return ret;
 	}
 
-	gpib_register_driver(&cb_pci_interface, THIS_MODULE);
-	gpib_register_driver(&cb_isa_interface, THIS_MODULE);
-	gpib_register_driver(&cb_pci_accel_interface, THIS_MODULE);
-	gpib_register_driver(&cb_pci_unaccel_interface, THIS_MODULE);
-	gpib_register_driver(&cb_isa_accel_interface, THIS_MODULE);
-	gpib_register_driver(&cb_isa_unaccel_interface, THIS_MODULE);
-
-#ifdef GPIB__PCMCIA
-	gpib_register_driver(&cb_pcmcia_interface, THIS_MODULE);
-	gpib_register_driver(&cb_pcmcia_accel_interface, THIS_MODULE);
-	gpib_register_driver(&cb_pcmcia_unaccel_interface, THIS_MODULE);
-	err += cb_pcmcia_init_module();
+	ret = gpib_register_driver(&cb_pci_interface, THIS_MODULE);
+	if (ret)
+		goto err_pci;
+
+	ret = gpib_register_driver(&cb_isa_interface, THIS_MODULE);
+	if (ret)
+		goto err_isa;
+
+	ret = gpib_register_driver(&cb_pci_accel_interface, THIS_MODULE);
+	if (ret)
+		goto err_pci_accel;
+
+	ret = gpib_register_driver(&cb_pci_unaccel_interface, THIS_MODULE);
+	if (ret)
+		goto err_pci_unaccel;
+
+	ret = gpib_register_driver(&cb_isa_accel_interface, THIS_MODULE);
+	if (ret)
+		goto err_isa_accel;
+
+	ret = gpib_register_driver(&cb_isa_unaccel_interface, THIS_MODULE);
+	if (ret)
+		goto err_isa_unaccel;
+
+#ifdef GPIB_PCMCIA
+	ret = gpib_register_driver(&cb_pcmcia_interface, THIS_MODULE);
+	if (ret)
+		goto err_pcmcia;
+
+	ret = gpib_register_driver(&cb_pcmcia_accel_interface, THIS_MODULE);
+	if (ret)
+		goto err_pcmcia_accel;
+
+	ret = gpib_register_driver(&cb_pcmcia_unaccel_interface, THIS_MODULE);
+	if (ret)
+		goto err_pcmcia_unaccel;
+
+	ret = pcmcia_register_driver(&cb_gpib_cs_driver);
+	if (ret)
+		goto err_pcmcia_driver;
 #endif
-	if (err)
-		return -1;
 
+	pr_info("cb7210: module init is complete\n");
 	return 0;
+
+#ifdef GPIB_PCMCIA
+err_pcmcia_driver:
+	pr_err("ines: pcmcia_register_driver failed: error = %d\n", ret);
+	gpib_unregister_driver(&cb_pcmcia_unaccel_interface);
+err_pcmcia_unaccel:
+	gpib_unregister_driver(&cb_pcmcia_accel_interface);
+err_pcmcia_accel:
+	gpib_unregister_driver(&cb_pcmcia_interface);
+err_pcmcia:
+#endif
+	gpib_unregister_driver(&cb_isa_unaccel_interface);
+err_isa_unaccel:
+	gpib_unregister_driver(&cb_isa_accel_interface);
+err_isa_accel:
+	gpib_unregister_driver(&cb_pci_unaccel_interface);
+err_pci_unaccel:
+	gpib_unregister_driver(&cb_pci_accel_interface);
+err_pci_accel:
+	gpib_unregister_driver(&cb_isa_interface);
+err_isa:
+	gpib_unregister_driver(&cb_pci_interface);
+err_pci:
+	pci_unregister_driver(&cb7210_pci_driver);
+
+	pr_err("cb7210: gpib_register_driver failed!\n");
+	return ret;
 }
 
 static void __exit cb7210_exit_module(void)
-- 
2.34.1