'\" t
.\"     Title: bus_for_each_dev
.\"    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 "BUS_FOR_EACH_DEV" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Device drivers infrastructure"
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.SH "NAME"
bus_for_each_dev \- device iterator\&.
.SH "SYNOPSIS"
.HP \w'int\ bus_for_each_dev('u
.BI "int bus_for_each_dev(struct\ bus_type\ *\ " "bus" ", struct\ device\ *\ " "start" ", void\ *\ " "data" ", int\ (*" "fn" ")\ (struct\ device\ *,\ void\ *));"
.SH "ARGUMENTS"
.PP
\fIbus\fR
.RS 4
bus type\&.
.RE
.PP
\fIstart\fR
.RS 4
device to start iterating from\&.
.RE
.PP
\fIdata\fR
.RS 4
data for the callback\&.
.RE
.PP
\fIfn\fR
.RS 4
function to be called for each device\&.
.RE
.SH "DESCRIPTION"
.PP
Iterate over
\fIbus\fR\*(Aqs list of devices, and call
\fIfn\fR
for each, passing it
\fIdata\fR\&. If
\fIstart\fR
is not NULL, we use that device to begin iterating from\&.
.PP
We check the return of
\fIfn\fR
each time\&. If it returns anything other than 0, we break out and return that value\&.
.SH "NOTE"
.PP
The device that returns a non\-zero value is not retained in any way, nor is its refcount incremented\&. If the caller needs to retain this data, it should do so, and increment the reference count in the supplied callback\&.
.SH "COPYRIGHT"
.br