diff options
| author | Reyad Attiyat <reyad.attiyat@gmail.com> | 2015-08-06 19:23:58 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-08 15:15:49 -0700 |
| commit | 4758dcd19a7d9ba9610b38fecb93f65f56f86346 (patch) | |
| tree | 54b9c2793c08662ef5a87be26ca07d036771cf2d /drivers/usb/host/xhci.c | |
| parent | 6c05cb145d6716f00d452aeb27916efb6d190cca (diff) | |
usb: xhci: Add support for URB_ZERO_PACKET to bulk/sg transfers
This commit checks for the URB_ZERO_PACKET flag and creates an extra
zero-length td if the urb transfer length is a multiple of the endpoint's
max packet length.
Signed-off-by: Reyad Attiyat <reyad.attiyat@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/xhci.c')
| -rw-r--r-- | drivers/usb/host/xhci.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 91fd32835312..6b0f4a47e402 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1340,6 +1340,11 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) if (usb_endpoint_xfer_isoc(&urb->ep->desc)) size = urb->number_of_packets; + else if (usb_endpoint_is_bulk_out(&urb->ep->desc) && + urb->transfer_buffer_length > 0 && + urb->transfer_flags & URB_ZERO_PACKET && + !(urb->transfer_buffer_length % usb_endpoint_maxp(&urb->ep->desc))) + size = 2; else size = 1; |