Add a BUS_CHILD_DELETED() method that a bus can hook to allow it to cleanup

any bus-specific state (such as ivars) when a child device is deleted.

Requested by:	kan
MFC after:	1 month

2 files changed, 56 insertions, 0 deletions

diff --git a/share/man/man9/BUS_CHILD_DELETED.9 b/share/man/man9/BUS_CHILD_DELETED.9
new file mode 100644
index 0000000..4caa856
--- /dev/null
+++ b/share/man/man9/BUS_CHILD_DELETED.9
@@ -0,0 +1,55 @@
+.\" -*- nroff -*-
+.\"
+.\" Copyright (c) 2012 Advanced Computing Technologies LLC
+.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd August 21, 2012
+.Dt BUS_CHILD_DELETED 9
+.Os
+.Sh NAME
+.Nm BUS_CHILD_DELETED
+.Nd "notify a bus device that a child is being deleted"
+.Sh SYNOPSIS
+.In sys/param.h
+.In sys/bus.h
+.Ft void
+.Fn BUS_CHILD_DELETED "device_t dev" "device_t child"
+.Sh DESCRIPTION
+The
+.Fn BUS_CHILD_DELETED
+method is invoked by the new-bus framework when a device is deleted.
+A bus driver can provide an implementation of this method to
+release bus-specific resources associated with a device such as
+instance variables.
+.Sh SEE ALSO
+.Xr BUS_ADD_CHILD 9 ,
+.Xr device 9
+.Sh HISTORY
+The
+.Fn BUS_CHILD_DELETED
+method first appeared in
+.Fx 10.0 .
diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
index 373da0b..33df4df 100644
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -26,6 +26,7 @@ MAN=	accept_filter.9 \
 	bus_alloc_resource.9 \
 	BUS_BIND_INTR.9 \
 	bus_child_present.9 \
+	BUS_CHILD_DELETED.9 \
 	BUS_CONFIG_INTR.9 \
 	BUS_DESCRIBE_INTR.9 \
 	bus_dma.9 \