dmaengine: consolidate assignment of DMA cookies

Everyone deals with assigning DMA cookies in the same way (it's part of
the API so they should be), so lets consolidate the common code into a
helper function to avoid this duplication.

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, 1 insertions, 16 deletions

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index b279e1920725..3a4ca67ace02 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -157,21 +157,6 @@ static void dwc_desc_put(struct dw_dma_chan *dwc, struct dw_desc *desc)
         }
 }
 
-/* Called with dwc->lock held and bh disabled */
-static dma_cookie_t
-dwc_assign_cookie(struct dw_dma_chan *dwc, struct dw_desc *desc)
-{
-        dma_cookie_t cookie = dwc->chan.cookie;
-
-        if (++cookie < 0)
-                cookie = 1;
-
-        dwc->chan.cookie = cookie;
-        desc->txd.cookie = cookie;
-
-        return cookie;
-}
-
 static void dwc_initialize(struct dw_dma_chan *dwc)
 {
         struct dw_dma *dw = to_dw_dma(dwc->chan.device);
@@ -603,7 +588,7 @@ static dma_cookie_t dwc_tx_submit(struct dma_async_tx_descriptor *tx)
         unsigned long           flags;
 
         spin_lock_irqsave(&dwc->lock, flags);
-        cookie = dwc_assign_cookie(dwc, desc);
+        cookie = dma_cookie_assign(tx);
 
         /*
          * REVISIT: We should attempt to chain as many descriptors as