[PATCH v5 11/15] staging: gpib: ines: Handle gpib_register_driver() errors

Nihar Chaithanya
2024-12-28T06:26:10Z

The function ines_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@gmail.com>
---
drivers/staging/gpib/ines/ines_gpib.c | 81 ++++++++++++++++++++-------
1 file changed, 60 insertions(+), 21 deletions(-)

diff --git a/drivers/staging/gpib/ines/ines_gpib.c b/drivers/staging/gpib/ines/ines_gpib.c
index 9d8387c3bf01..73df4cd16926 100644
--- a/drivers/staging/gpib/ines/ines_gpib.c
+++ b/drivers/staging/gpib/ines/ines_gpib.c
@@ -1227,12 +1227,6 @@ static struct pcmcia_driver ines_gpib_cs_driver = {
.resume = ines_gpib_resume,
};

-int ines_pcmcia_init_module(void)
-{
- pcmcia_register_driver(&ines_gpib_cs_driver);
- return 0;
-}
-
void ines_pcmcia_cleanup_module(void)
{
DEBUG(0, "ines_cs: unloading\n");
@@ -1420,28 +1414,73 @@ void ines_pcmcia_detach(gpib_board_t *board)

static int __init ines_init_module(void)
{
- int err = 0;
+ int ret;

- err = pci_register_driver(&ines_pci_driver);
- if (err) {
- pr_err("ines_gpib: pci_driver_register failed!\n");
- return err;
+ ret = pci_register_driver(&ines_pci_driver);
+ if (ret) {
+ pr_err("ines_gpib: pci_driver_register failed: error = %d\n", ret);
+ return ret;
}

- gpib_register_driver(&ines_pci_interface, THIS_MODULE);
- gpib_register_driver(&ines_pci_unaccel_interface, THIS_MODULE);
- gpib_register_driver(&ines_pci_accel_interface, THIS_MODULE);
- gpib_register_driver(&ines_isa_interface, THIS_MODULE);
+ ret = gpib_register_driver(&ines_pci_interface, THIS_MODULE);
+ if (ret)
+ goto err_pci;
+
+ ret = gpib_register_driver(&ines_pci_unaccel_interface, THIS_MODULE);
+ if (ret)
+ goto err_pci_unaccel;
+
+ ret = gpib_register_driver(&ines_pci_accel_interface, THIS_MODULE);
+ if (ret)
+ goto err_pci_accel;
+
+ ret = gpib_register_driver(&ines_isa_interface, THIS_MODULE);
+ if (ret)
+ goto err_isa;
+
#ifdef GPIB_PCMCIA
- gpib_register_driver(&ines_pcmcia_interface, THIS_MODULE);
- gpib_register_driver(&ines_pcmcia_unaccel_interface, THIS_MODULE);
- gpib_register_driver(&ines_pcmcia_accel_interface, THIS_MODULE);
- err += ines_pcmcia_init_module();
+ ret = gpib_register_driver(&ines_pcmcia_interface, THIS_MODULE);
+ if (ret)
+ goto err_pcmcia;
+
+ ret = gpib_register_driver(&ines_pcmcia_unaccel_interface, THIS_MODULE);
+ if (ret)
+ goto err_pcmcia_unaccel;
+
+ ret = gpib_register_driver(&ines_pcmcia_accel_interface, THIS_MODULE);
+ if (ret)
+ goto err_pcmcia_accel;
+
+ ret = pcmcia_register_driver(&ines_gpib_cs_driver);
+ if (ret)
+ goto err_pcmcia_driver;
#endif
- if (err)
- return -1;

+ pr_info("ines_gpib: module init is complete\n");
return 0;
+
+#ifdef GPIB_PCMCIA
+err_pcmcia_driver:
+ pr_err("ines_gpib: pcmcia_register_driver failed: error = %d\n", ret);
+ gpib_unregister_driver(&ines_pcmcia_accel_interface);
+err_pcmcia_accel:
+ gpib_unregister_driver(&ines_pcmcia_unaccel_interface);
+err_pcmcia_unaccel:
+ gpib_unregister_driver(&ines_pcmcia_interface);
+err_pcmcia:
+#endif
+ gpib_unregister_driver(&ines_isa_interface);
+err_isa:
+ gpib_unregister_driver(&ines_pci_accel_interface);
+err_pci_accel:
+ gpib_unregister_driver(&ines_pci_unaccel_interface);
+err_pci_unaccel:
+ gpib_unregister_driver(&ines_pci_interface);
+err_pci:
+ pci_unregister_driver(&ines_pci_driver);
+
+ pr_err("ines_gpib: gpib_register_driver failed!\n");
+ return ret;
}

static void __exit ines_exit_module(void)
--
2.34.1