BUS_RELEASE_RESOURCE(9)                      FreeBSD Kernel Developer's Manual

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 resource 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 resource, i.e., the resource itself, returned
     by bus_alloc_resource(9).

RETURN VALUES
     EINVAL is returned, if the device dev has no parent, 0 otherwise.  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>.

FreeBSD 13.1-RELEASE-p6          May 18, 2000          FreeBSD 13.1-RELEASE-p6