staging: gpib: Modify gpib_register_driver() to return error if it fails

The function gpib_register_driver() can fail if kmalloc() fails,
but it doesn't return any error if that happens.

Modify the function to return error i.e int. Return the appropriate
error code if it fails. Remove the pr_info() statement.

Signed-off-by: Nihar Chaithanya <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: niharcy

drivers/staging/gpib/common/gpib_os.c

@@ -2094,18 +2094,19 @@ void init_gpib_descriptor(gpib_descriptor_t *desc)
 	atomic_set(&desc->io_in_progress, 0);
 }
 
-void gpib_register_driver(gpib_interface_t *interface, struct module *provider_module)
+int gpib_register_driver(gpib_interface_t *interface, struct module *provider_module)
 {
 	struct gpib_interface_list_struct *entry;
 
 	entry = kmalloc(sizeof(*entry), GFP_KERNEL);
 	if (!entry)
-		return;
+		return -ENOMEM;
 
 	entry->interface = interface;
 	entry->module = provider_module;
 	list_add(&entry->list, &registered_drivers);
-	pr_info("gpib: registered %s interface\n", interface->name);
+
+	return 0;
 }
 EXPORT_SYMBOL(gpib_register_driver);
 

drivers/staging/gpib/include/gpibP.h

@@ -17,7 +17,7 @@
 #include <linux/fs.h>
 #include <linux/interrupt.h>
 
-void gpib_register_driver(gpib_interface_t *interface, struct module *mod);
+int gpib_register_driver(gpib_interface_t *interface, struct module *mod);
 void gpib_unregister_driver(gpib_interface_t *interface);
 struct pci_dev *gpib_pci_get_device(const gpib_board_config_t *config, unsigned int vendor_id,
 				    unsigned int device_id, struct pci_dev *from);