dmaengine: move last completed cookie into generic dma_chan structure

Every DMA engine implementation declares a last completed dma cookie
in their private dma channel structures.  This is pointless, and
forces driver specific code.  Move this out into the common dma_chan
structure.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
index a6f9c1684a0..a1d15598cf7 100644
--- a/drivers/dma/timb_dma.c
+++ b/drivers/dma/timb_dma.c
@@ -84,7 +84,6 @@ struct timb_dma_chan {
                                         especially the lists and descriptors,
                                         from races between the tasklet and calls
                                         from above */
-        dma_cookie_t            last_completed_cookie;
         bool                    ongoing;
         struct list_head        active_list;
         struct list_head        queue;
@@ -284,7 +283,7 @@ static void __td_finish(struct timb_dma_chan *td_chan)
         else
                 iowrite32(0, td_chan->membase + TIMBDMA_OFFS_TX_DLAR);
 */
-        td_chan->last_completed_cookie = txd->cookie;
+        td_chan->chan.completed_cookie = txd->cookie;
         td_chan->ongoing = false;
 
         callback = txd->callback;
@@ -481,7 +480,7 @@ static int td_alloc_chan_resources(struct dma_chan *chan)
         }
 
         spin_lock_bh(&td_chan->lock);
-        td_chan->last_completed_cookie = 1;
+        chan->completed_cookie = 1;
         chan->cookie = 1;
         spin_unlock_bh(&td_chan->lock);
 
@@ -523,7 +522,7 @@ static enum dma_status td_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
 
         dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
 
-        last_complete = td_chan->last_completed_cookie;
+        last_complete = chan->completed_cookie;
         last_used = chan->cookie;
 
         ret = dma_async_is_complete(cookie, last_complete, last_used);