[PATCH] tokenring: fix module_init error handling

[Akinobu Mita <akinobu.mita@gmail.com>]

- 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(-)

Index: work-fault-inject/drivers/net/tokenring/proteon.c
===================================================================
--- work-fault-inject.orig/drivers/net/tokenring/proteon.c
+++ work-fault-inject/drivers/net/tokenring/proteon.c
@@ -370,6 +370,10 @@ static int __init proteon_init(void)
 		dev->dma = dma[i];
 		pdev = platform_device_register_simple("proteon",
 			i, NULL, 0);
+		if (IS_ERR(pdev)) {
+			free_netdev(dev);
+			continue;
+		}
 		err = setup_card(dev, &pdev->dev);
 		if (!err) {
 			proteon_dev[i] = pdev;
@@ -385,9 +389,10 @@ static int __init proteon_init(void)
 	/* Probe for cards. */
 	if (num == 0) {
 		printk(KERN_NOTICE "proteon.c: No cards found.\n");
-		return (-ENODEV);
+		platform_driver_unregister(&proteon_driver);
+		return -ENODEV;
 	}
-	return (0);
+	return 0;
 }
 
 static void __exit proteon_cleanup(void)
Index: work-fault-inject/drivers/net/tokenring/skisa.c
===================================================================
--- work-fault-inject.orig/drivers/net/tokenring/skisa.c
+++ work-fault-inject/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)