---
name: "usb_buffer_unmap"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/usb_buffer_unmap"
---

# usb\_buffer\_unmap(9)

free DMA mapping(s) for an urb

## NAME

usb\_buffer\_unmap - free DMA mapping(s) for an urb

## SYNOPSIS

**void usb\_buffer\_unmap(struct urb \*** *urb***);**

## ARGUMENTS

*urb*

urb whose transfer\_buffer will be unmapped

## DESCRIPTION

Reverses the effect of **usb\_buffer\_map**.

## COPYRIGHT