ioat1: trim ioat_dma_desc_sw

Save 4 bytes per software descriptor by transmitting tx_cnt in an unused
portion of the hardware descriptor.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index abc96c4c0796..f59b6f42f866 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -396,7 +396,7 @@ static dma_cookie_t ioat1_tx_submit(struct dma_async_tx_descriptor *tx)
         dump_desc_dbg(ioat, chain_tail);
         dump_desc_dbg(ioat, first);
 
-        ioat->pending += desc->tx_cnt;
+        ioat->pending += desc->hw->tx_cnt;
         if (ioat->pending >= ioat_pending_level)
                 __ioat1_dma_memcpy_issue_pending(ioat);
         spin_unlock_bh(&ioat->desc_lock);
@@ -655,11 +655,11 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
         spin_unlock_bh(&ioat->desc_lock);
 
         desc->txd.flags = flags;
-        desc->tx_cnt = tx_cnt;
         desc->len = total_len;
         list_splice(&chain, &desc->txd.tx_list);
         hw->ctl_f.int_en = !!(flags & DMA_PREP_INTERRUPT);
         hw->ctl_f.compl_write = 1;
+        hw->tx_cnt = tx_cnt;
         dump_desc_dbg(ioat, desc);
 
         return &desc->txd;