'\" t
.\"     Title: usb_driver_set_configuration
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: USB Core APIs
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "USB_DRIVER_SET_CONFI" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "USB Core APIs"
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.SH "NAME"
usb_driver_set_configuration \- Provide a way for drivers to change device configurations
.SH "SYNOPSIS"
.HP \w'int\ usb_driver_set_configuration('u
.BI "int usb_driver_set_configuration(struct\ usb_device\ *\ " "udev" ", int\ " "config" ");"
.SH "ARGUMENTS"
.PP
\fIudev\fR
.RS 4
the device whose configuration is being updated
.RE
.PP
\fIconfig\fR
.RS 4
the configuration being chosen\&.
.RE
.SH "CONTEXT"
.PP
In process context, must be able to sleep
.SH "DESCRIPTION"
.PP
Device interface drivers are not allowed to change device configurations\&. This is because changing configurations will destroy the interface the driver is bound to and create new ones; it would be like a floppy\-disk driver telling the computer to replace the floppy\-disk drive with a tape drive!
.PP
Still, in certain specialized circumstances the need may arise\&. This routine gets around the normal restrictions by using a work thread to submit the change\-config request\&.
.SH "RETURN"
.PP
0 if the request was successfully queued, error code otherwise\&. The caller has no way to know whether the queued request will eventually succeed\&.
.SH "COPYRIGHT"
.br