[11/14] net: plip: return proper error values from attach

Commit Message

Sudip Mukherjee April 8, 2015, 11:20 a.m. UTC

now that we are monitoring the return value from attach, make the
required changes to return proper value from its attach function.
also return the proper error code in module_init.

Signed-off-by: Sudip Mukherjee <[e-mail]>
---
 drivers/net/plip/plip.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

Patch

diff --git a/drivers/net/plip/plip.c b/drivers/net/plip/plip.c
index 040b897..6706bc3 100644
--- a/drivers/net/plip/plip.c
+++ b/drivers/net/plip/plip.c
@@ -1243,7 +1243,7 @@  plip_searchfor(int list[], int a)
 
 /* plip_attach() is called (by the parport code) when a port is
  * available to use. */
-static void plip_attach (struct parport *port)
+static int plip_attach(struct parport *port)
 {
 	static int unit;
 	struct net_device *dev;
@@ -1254,13 +1254,13 @@  static void plip_attach (struct parport *port)
 	    plip_searchfor(parport, port->number)) {
 		if (unit == PLIP_MAX) {
 			printk(KERN_ERR "plip: too many devices\n");
-			return;
+			return -EINVAL;
 		}
 
 		sprintf(name, "plip%d", unit);
 		dev = alloc_etherdev(sizeof(struct net_local));
 		if (!dev)
-			return;
+			return -ENOMEM;
 
 		strcpy(dev->name, name);
 
@@ -1300,12 +1300,13 @@  static void plip_attach (struct parport *port)
 					 dev->name, dev->base_addr);
 		dev_plip[unit++] = dev;
 	}
-	return;
+	return 0;
 
 err_parport_unregister:
 	parport_unregister_device(nl->pardev);
 err_free_dev:
 	free_netdev(dev);
+	return -ENODEV;
 }
 
 /* plip_detach() is called (by the parport code) when a port is
@@ -1379,6 +1380,8 @@  __setup("plip=", plip_setup);
 
 static int __init plip_init (void)
 {
+	int err;
+
 	if (parport[0] == -2)
 		return 0;
 
@@ -1387,9 +1390,10 @@  static int __init plip_init (void)
 		timid = 0;
 	}
 
-	if (parport_register_driver (&plip_driver)) {
+	err = parport_register_driver(&plip_driver);
+	if (err) {
 		printk (KERN_WARNING "plip: couldn't register driver\n");
-		return 1;
+		return err;
 	}
 
 	return 0;