'\" t
.\"     Title: device_add
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Device drivers infrastructure
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "DEVICE_ADD" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Device drivers infrastructure"
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.SH "NAME"
device_add \- add device to device hierarchy\&.
.SH "SYNOPSIS"
.HP \w'int\ device_add('u
.BI "int device_add(struct\ device\ *\ " "dev" ");"
.SH "ARGUMENTS"
.PP
\fIdev\fR
.RS 4
device\&.
.RE
.SH "DESCRIPTION"
.PP
This is part 2 of
\fBdevice_register\fR, though may be called separately _iff_
\fBdevice_initialize\fR
has been called separately\&.
.PP
This adds
\fIdev\fR
to the kobject hierarchy via
\fBkobject_add\fR, adds it to the global and sibling lists for the device, then adds it to the other relevant subsystems of the driver model\&.
.PP
Do not call this routine or
\fBdevice_register\fR
more than once for any device structure\&. The driver model core is not designed to work with devices that get unregistered and then spring back to life\&. (Among other things, it\*(Aqs very hard to guarantee that all references to the previous incarnation of
\fIdev\fR
have been dropped\&.) Allocate and register a fresh new struct device instead\&.
.SH "NOTE"
.PP
_Never_ directly free
\fIdev\fR
after calling this function, even if it returned an error! Always use
\fBput_device\fR
to give up your reference instead\&.
.SH "COPYRIGHT"
.br