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.\"     Title: struct usb_sg_request
.\"    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: Host-Side Data Types and Macros
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "STRUCT USB_SG_REQUES" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Host-Side Data Types and Macro"
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.SH "NAME"
struct_usb_sg_request \- support for scatter/gather I/O
.SH "SYNOPSIS"
.sp
.nf
struct usb_sg_request {
  int status;
  size_t bytes;
};  
.fi
.SH "MEMBERS"
.PP
status
.RS 4
zero indicates success, else negative errno
.RE
.PP
bytes
.RS 4
counts bytes transferred\&.
.RE
.SH "DESCRIPTION"
.PP
These requests are initialized using
\fBusb_sg_init\fR, and then are used as request handles passed to
\fBusb_sg_wait\fR
or
\fBusb_sg_cancel\fR\&. Most members of the request object aren\*(Aqt for driver access\&.
.PP
The status and bytecount values are valid only after
\fBusb_sg_wait\fR
returns\&. If the status is zero, then the bytecount matches the total from the request\&.
.PP
After an error completion, drivers may need to clear a halt condition on the endpoint\&.
.SH "COPYRIGHT"
.br