fsldma: major cleanups and fixes

Fix locking. Use two queues in the driver, one for pending transacions, and
one for transactions which are actually running on the hardware. Call
dma_run_dependencies() on descriptor cleanup so that the async_tx API works
correctly.

There are a number of places throughout the code where lists of descriptors
are freed in a loop. Create functions to handle this, and use them instead
of open-coding the loop each time.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index ea3b19c8708..cb4d6ff5159 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -131,7 +131,8 @@ struct fsldma_chan {
         struct fsldma_chan_regs __iomem *regs;
         dma_cookie_t completed_cookie;  /* The maximum cookie completed */
         spinlock_t desc_lock;           /* Descriptor operation lock */
-        struct list_head ld_queue;      /* Link descriptors queue */
+        struct list_head ld_pending;    /* Link descriptors queue */
+        struct list_head ld_running;    /* Link descriptors queue */
         struct dma_chan common;         /* DMA common channel */
         struct dma_pool *desc_pool;     /* Descriptors pool */
         struct device *dev;             /* Channel device */