diff options
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 519dc14a8794..81bb8bfdb7e6 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3116,6 +3116,27 @@ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred, return (total_packet_count - ((transferred + trb_buff_len) / maxp)); } +static int xhci_align_td(struct xhci_hcd *xhci, struct urb *urb, u32 enqd_len, + u32 *trb_buff_len) +{ + unsigned int unalign; + unsigned int max_pkt; + + max_pkt = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc)); + unalign = (enqd_len + *trb_buff_len) % max_pkt; + + /* we got lucky, last normal TRB data on segment is packet aligned */ + if (unalign == 0) + return 0; + + /* is the last nornal TRB alignable by splitting it */ + if (*trb_buff_len > unalign) { + *trb_buff_len -= unalign; + return 0; + } + return 1; +} + /* This is very similar to what ehci-q.c qtd_fill() does */ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, struct urb *urb, int slot_id, unsigned int ep_index) @@ -3198,6 +3219,12 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, */ if (enqd_len + trb_buff_len < full_len) { field |= TRB_CHAIN; + if (last_trb(xhci, ring, ring->enq_seg, + ring->enqueue + 1)) { + if (xhci_align_td(xhci, urb, enqd_len, + &trb_buff_len)) + xhci_dbg(xhci, "TRB align fail\n"); + } } else { field |= TRB_IOC; more_trbs_coming = false; |