dmaengine: Freescale: change descriptor release process for supporting async_tx

[linux-block.git] / drivers / dma / fsldma.h

diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index f2e0c4dcf901e5c054c8191057ee7c0cdc1d0b0a..239c20c84382ce4c724858f5af5ed5c92a5c1416 100644 (file)
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -149,8 +149,21 @@ struct fsldma_chan {
        char name[8];                   /* Channel name */
        struct fsldma_chan_regs __iomem *regs;
        spinlock_t desc_lock;           /* Descriptor operation lock */
-       struct list_head ld_pending;    /* Link descriptors queue */
-       struct list_head ld_running;    /* Link descriptors queue */
+       /*
+        * Descriptors which are queued to run, but have not yet been
+        * submitted to the hardware for execution
+        */
+       struct list_head ld_pending;
+       /*
+        * Descriptors which are currently being executed by the hardware
+        */
+       struct list_head ld_running;
+       /*
+        * Descriptors which have finished execution by the hardware. These
+        * descriptors have already had their cleanup actions run. They are
+        * waiting for the ACK bit to be set by the async_tx API.
+        */
+       struct list_head ld_completed;  /* Link descriptors queue */
        struct dma_chan common;         /* DMA common channel */
        struct dma_pool *desc_pool;     /* Descriptors pool */
        struct device *dev;             /* Channel device */