[PATCH] tokenring: fix module_init error handling

- Call platform_driver_unregister() before return when no cards found.
  (fixes data corruption when no cards found)

- Check platform_device_register_simple() return value

Cc: Jeff Garzik <jgarzik@pobox.com>
Cc: Mike Phillips <mikep@linuxtr.net>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>

 drivers/net/tokenring/proteon.c |    9 +++++++--
 drivers/net/tokenring/skisa.c   |    9 +++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/tokenring/skisa.c b/drivers/net/tokenring/skisa.c
index d6ba41cf3110..33afea31d87b 100644
--- a/drivers/net/tokenring/skisa.c
+++ b/drivers/net/tokenring/skisa.c
@@ -380,6 +380,10 @@ static int __init sk_isa_init(void)
                 dev->dma = dma[i];
                 pdev = platform_device_register_simple("skisa",
                         i, NULL, 0);
+                if (IS_ERR(pdev)) {
+                        free_netdev(dev);
+                        continue;
+                }
                 err = setup_card(dev, &pdev->dev);
                 if (!err) {
                         sk_isa_dev[i] = pdev;
@@ -395,9 +399,10 @@ static int __init sk_isa_init(void)
         /* Probe for cards. */
         if (num == 0) {
                 printk(KERN_NOTICE "skisa.c: No cards found.\n");
-                return (-ENODEV);
+                platform_driver_unregister(&sk_isa_driver);
+                return -ENODEV;
         }
-        return (0);
+        return 0;
 }
 
 static void __exit sk_isa_cleanup(void)