bus_release_resource(9)

NAME

bus_release_resource - release resources on a bus

SYNOPSIS

#include <sys/param.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
int
bus_release_resource(device_t dev, int type, int rid,
        struct resource *r);

DESCRIPTION

Free a resource allocated by bus_alloc_resource(9). The re

source must
not be in use on release, i.e., call an appropriate function

before (e.g.
bus_teardown_intr(9) for IRQs).

dev is the device that owns the resource.

type is the type of resource that is released. It must be

of the same
type you allocated it as before. See bus_alloc_resource(9)

for valid
types.

rid is the resource ID of the resource. The rid value must

be the same
as the one returned by bus_alloc_resource(9).

r is the pointer to struct res, i.e., the resource itself,

returned by
bus_alloc_resource(9).

RETURN VALUES

EINVAL is returned, if the device dev has no parent, 0 oth

erwise. The
kernel will panic, if it cannot release the resource.

EXAMPLES

/* deactivate IRQ */
bus_teardown_intr(dev, foosoftc->irqres,

foosoftc->irqid);

/* release IRQ resource */
bus_release_resource(dev, SYS_RES_IRQ,

foosoftc->irqid,

foosoftc->irqres);

/* release I/O port resource */
bus_release_resource(dev, SYS_RES_IOPORT,

foosoftc->portid,

foosoftc->portres);

SEE ALSO

bus_alloc_resource(9), device(9), driver(9)

AUTHORS

This manual page was written by Alexander Langer

<alex@big.endian.de>.

BSD May 18, 2000

BSD