diff options
Diffstat (limited to 'drivers/usb/host')
| -rw-r--r-- | drivers/usb/host/whci/qset.c | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c index 39e855a55c6..7d4204db0f6 100644 --- a/drivers/usb/host/whci/qset.c +++ b/drivers/usb/host/whci/qset.c @@ -465,16 +465,16 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u * - the previous one isn't full. * * If a new std is needed but the previous one - * did not end on a wMaxPacketSize boundary - * then this sg list cannot be mapped onto - * multiple qTDs. Return an error and let the - * caller sort it out. + * was not a whole number of packets then this + * sg list cannot be mapped onto multiple + * qTDs. Return an error and let the caller + * sort it out. */ if (!std || (prev_end & (WHCI_PAGE_SIZE-1)) || (dma_addr & (WHCI_PAGE_SIZE-1)) || std->len + WHCI_PAGE_SIZE > QTD_MAX_XFER_SIZE) { - if (prev_end % qset->max_packet != 0) + if (std->len % qset->max_packet != 0) return -EINVAL; std = qset_new_std(whc, qset, urb, mem_flags); if (std == NULL) { @@ -487,14 +487,14 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u dma_len = dma_remaining; /* - * If the remainder in this element doesn't - * fit in a single qTD, end the qTD on a - * wMaxPacketSize boundary. + * If the remainder of this element doesn't + * fit in a single qTD, limit the qTD to a + * whole number of packets. This allows the + * remainder to go into the next qTD. */ if (std->len + dma_len > QTD_MAX_XFER_SIZE) { - dma_len = QTD_MAX_XFER_SIZE - std->len; - ep = ((dma_addr + dma_len) / qset->max_packet) * qset->max_packet; - dma_len = ep - dma_addr; + dma_len = (QTD_MAX_XFER_SIZE / qset->max_packet) + * qset->max_packet - std->len; } std->len += dma_len; |