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path: root/drivers/ntb/ntb_transport.c
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Diffstat (limited to 'drivers/ntb/ntb_transport.c')
-rw-r--r--drivers/ntb/ntb_transport.c17
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);