struct usb_sg_request
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## Name

struct usb_sg_request — support for scatter/gather I/O

## Synopsis

    struct usb_sg_request {
      int status;
      size_t bytes;
    };

## Members

status

  zero indicates success, else negative errno

bytes

  counts bytes transferred.

## Description

These requests are initialized using `usb_sg_init`, and then are used as request handles passed to `usb_sg_wait` or `usb_sg_cancel`. Most members of the request object aren't for driver access.

The status and bytecount values are valid only after `usb_sg_wait` returns. If the status is zero, then the bytecount matches the total from the request.

After an error completion, drivers may need to clear a halt condition on the endpoint.

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