[PATCH] ipw2200: Enable rtap interface for RF promiscuous mode while associated

[safe/jmp/linux-2.6] / drivers / char / tipar.c

diff --git a/drivers/char/tipar.c b/drivers/char/tipar.c
index 41a94bc..eb2eb3e 100644 (file)
--- a/drivers/char/tipar.c
+++ b/drivers/char/tipar.c
@@ -250,12 +250,17 @@ tipar_open(struct inode *inode, struct file *file)
 {
        unsigned int minor = iminor(inode) - TIPAR_MINOR;
 
-       if (minor > tp_count - 1)
+       if (tp_count == 0 || minor > tp_count - 1)
                return -ENXIO;
 
        if (test_and_set_bit(minor, &opened))
                return -EBUSY;
 
+       if (!table[minor].dev) {
+               printk(KERN_ERR "%s: NULL device for minor %u\n",
+                               __FUNCTION__, minor);
+               return -ENXIO;
+       }
        parport_claim_or_block(table[minor].dev);
        init_ti_parallel(minor);
        parport_release(table[minor].dev);
@@ -510,16 +515,20 @@ tipar_init_module(void)
                err = PTR_ERR(tipar_class);
                goto out_chrdev;
        }
-       if (parport_register_driver(&tipar_driver)) {
+       if (parport_register_driver(&tipar_driver) || tp_count == 0) {
                printk(KERN_ERR "tipar: unable to register with parport\n");
                err = -EIO;
-               goto out;
+               goto out_class;
        }
 
        err = 0;
        goto out;
 
+out_class:
+       class_destroy(tipar_class);
+
 out_chrdev:
+       devfs_remove("ticables/par");
        unregister_chrdev(TIPAR_MAJOR, "tipar");
 out:
        return err;