Re: [PATCH] Driver Core update for 2.6.4

[Greg KH <greg@kroah.com>]

ChangeSet 1.1608.84.3, 2004/03/10 16:05:00-08:00, chrisw@osdl.org

[PATCH] class_simple clean up in lp

Error condition isn't caught on class_simple_create, and
parport_register_driver failure doesn't do proper cleanup.


 drivers/char/lp.c |   16 ++++++++++++++--
 1 files changed, 14 insertions(+), 2 deletions(-)


diff -Nru a/drivers/char/lp.c b/drivers/char/lp.c
--- a/drivers/char/lp.c	Mon Mar 15 15:30:05 2004
+++ b/drivers/char/lp.c	Mon Mar 15 15:30:05 2004
@@ -869,7 +869,7 @@
 
 int __init lp_init (void)
 {
-	int i;
+	int i, err = 0;
 
 	if (parport_nr[0] == LP_PARPORT_OFF)
 		return 0;
@@ -900,10 +900,15 @@
 
 	devfs_mk_dir("printers");
 	lp_class = class_simple_create(THIS_MODULE, "printer");
+	if (IS_ERR(lp_class)) {
+		err = PTR_ERR(lp_class);
+		goto out_devfs;
+	}
 
 	if (parport_register_driver (&lp_driver)) {
 		printk (KERN_ERR "lp: unable to register with parport\n");
-		return -EIO;
+		err = -EIO;
+		goto out_class;
 	}
 
 	if (!lp_count) {
@@ -915,6 +920,13 @@
 	}
 
 	return 0;
+
+out_class:
+	class_simple_destroy(lp_class);
+out_devfs:
+	devfs_remove("printers");
+	unregister_chrdev(LP_MAJOR, "lp");
+	return err;
 }
 
 static int __init lp_init_module (void)