device_unregister(9) [centos man page]

DEVICE_UNREGISTER(9)					   Device drivers infrastructure				      DEVICE_UNREGISTER(9)

NAME

       device_unregister - unregister device from system.

SYNOPSIS

       void device_unregister(struct device * dev);

ARGUMENTS

       dev
	   device going away.

DESCRIPTION

       We do this in two parts, like we do device_register. First, we remove it from all the subsystems with device_del, then we decrement the
       reference count via put_device. If that is the final reference count, the device will be cleaned up via device_release above. Otherwise,
       the structure will stick around until the final reference to the device is dropped.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						      DEVICE_UNREGISTER(9)

DEVICE_SCHEDULE_CALL(9) 				   Device drivers infrastructure				   DEVICE_SCHEDULE_CALL(9)

NAME

       device_schedule_callback_owner - helper to schedule a callback for a device

SYNOPSIS

       int device_schedule_callback_owner(struct device * dev, void (*func) (struct device *), struct module * owner);

ARGUMENTS

       dev
	   device.

       func
	   callback function to invoke later.

       owner
	   module owning the callback routine

DESCRIPTION

       Attribute methods must not unregister themselves or their parent device (which would amount to the same thing). Attempts to do so will
       deadlock, since unregistration is mutually exclusive with driver callbacks.

       Instead methods can call this routine, which will attempt to allocate and schedule a workqueue request to call back func with dev as its
       argument in the workqueue's process context.  dev will be pinned until func returns.

       This routine is usually called via the inline device_schedule_callback, which automatically sets owner to THIS_MODULE.

       Returns 0 if the request was submitted, -ENOMEM if storage could not be allocated, -ENODEV if a reference to owner isn't available.

NOTE

       This routine won't work if CONFIG_SYSFS isn't set! It uses an underlying sysfs routine (since it is intended for use by attribute methods),
       and if sysfs isn't available you'll get nothing but -ENOSYS.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014						   DEVICE_SCHEDULE_CALL(9)