diff options
| -rw-r--r-- | drivers/base/sys.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/base/sys.c b/drivers/base/sys.c index 8e13fd942163..1a06c2393719 100644 --- a/drivers/base/sys.c +++ b/drivers/base/sys.c @@ -167,6 +167,22 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv) { int err = 0; + if (!cls) { + printk(KERN_WARNING "sysdev: invalid class passed to " + "sysdev_driver_register!\n"); + WARN_ON(1); + return -EINVAL; + } + + /* Check whether this driver has already been added to a class. */ + if ((drv->entry.next != drv->entry.prev) || + (drv->entry.next != NULL)) { + printk(KERN_WARNING "sysdev: class %s: driver (%p) has already" + " been registered to a class, something is wrong, but " + "will forge on!\n", cls->name, drv); + WARN_ON(1); + } + mutex_lock(&sysdev_drivers_lock); if (cls && kset_get(&cls->kset)) { list_add_tail(&drv->entry, &cls->drivers); |