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[usb] Generalise zero-length packet generation logic

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The decision on whether or not a zero-length packet needs to be
transmitted is independent of the host controller and belongs in the
USB core.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-09-13 00:49:56 +01:00
parent 8baefad659
commit f9e192605c
6 changed files with 20 additions and 19 deletions
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9
src/drivers/usb/usbio.c
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@@ -1005,17 +1005,14 @@ static int usbio_endpoint_message ( struct usb_endpoint *ep,
*
* @v ep USB endpoint
* @v iobuf I/O buffer
* @v terminate Terminate using a short packet
* @v zlp Append a zero-length packet
* @ret rc Return status code
*/
static int usbio_endpoint_stream ( struct usb_endpoint *ep,
struct io_buffer *iobuf, int terminate ) {
size_t len = iob_len ( iobuf );
int zlen;
struct io_buffer *iobuf, int zlp ) {
/* Enqueue transfer */
zlen = ( terminate && ( ( len & ( ep->mtu - 1 ) ) == 0 ) );
return usbio_endpoint_enqueue ( ep, iobuf, ( zlen ? USBIO_ZLEN : 0 ) );
return usbio_endpoint_enqueue ( ep, iobuf, ( zlp ? USBIO_ZLEN : 0 ) );
}
/**