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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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8
src/drivers/bus/usb.c
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@@ -530,6 +530,7 @@ int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf,
int terminate ) {
struct usb_device *usb = ep->usb;
struct usb_port *port = usb->port;
int zlp;
int rc;
/* Fail immediately if device has been unplugged */
@@ -541,8 +542,13 @@ int usb_stream ( struct usb_endpoint *ep, struct io_buffer *iobuf,
( ( rc = usb_endpoint_reset ( ep ) ) != 0 ) )
return rc;
/* Append a zero-length packet if necessary */
zlp = terminate;
if ( iob_len ( iobuf ) & ( ep->mtu - 1 ) )
zlp = 0;
/* Enqueue stream transfer */
if ( ( rc = ep->host->stream ( ep, iobuf, terminate ) ) != 0 ) {
if ( ( rc = ep->host->stream ( ep, iobuf, zlp ) ) != 0 ) {
DBGC ( usb, "USB %s %s could not enqueue stream transfer: %s\n",
usb->name, usb_endpoint_name ( ep ), strerror ( rc ) );
return rc;