diff options
Diffstat (limited to 'drivers/ntb/ntb_transport.c')
| -rw-r--r-- | drivers/ntb/ntb_transport.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 6e3ee907d186..3903dfc39975 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -1996,23 +1996,24 @@ EXPORT_SYMBOL_GPL(ntb_transport_qp_num); */ unsigned int ntb_transport_max_size(struct ntb_transport_qp *qp) { - unsigned int max; + unsigned int max_size; unsigned int copy_align; + struct dma_chan *rx_chan, *tx_chan; if (!qp) return 0; - if (!qp->tx_dma_chan && !qp->rx_dma_chan) - return qp->tx_max_frame - sizeof(struct ntb_payload_header); + rx_chan = qp->rx_dma_chan; + tx_chan = qp->tx_dma_chan; - copy_align = max(qp->tx_dma_chan->device->copy_align, - qp->rx_dma_chan->device->copy_align); + copy_align = max(rx_chan ? rx_chan->device->copy_align : 0, + tx_chan ? tx_chan->device->copy_align : 0); /* If DMA engine usage is possible, try to find the max size for that */ - max = qp->tx_max_frame - sizeof(struct ntb_payload_header); - max -= max % (1 << copy_align); + max_size = qp->tx_max_frame - sizeof(struct ntb_payload_header); + max_size = round_down(max_size, 1 << copy_align); - return max; + return max_size; } EXPORT_SYMBOL_GPL(ntb_transport_max_size); |