[S390] tape class return value handling.

Without this patch register_tape_dev() will always fail, but might
return a value that is not an error number. This will lead to accesses
to already freed memory areas...

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/char/tape_class.c b/drivers/s390/char/tape_class.c
index 643b6d0..56b8761 100644 (file)
--- a/drivers/s390/char/tape_class.c
+++ b/drivers/s390/char/tape_class.c
@@ -76,7 +76,7 @@ struct tape_class_device *register_tape_dev(
                                device,
                                "%s", tcd->device_name
                        );
-       rc = PTR_ERR(tcd->class_device);
+       rc = IS_ERR(tcd->class_device) ? PTR_ERR(tcd->class_device) : 0;
        if (rc)
                goto fail_with_cdev;
        rc = sysfs_create_link(