Merge branch 'for-4.9/block' of git://git.kernel.dk/linux-block

[cascardo/linux.git] / drivers / dma / pl330.c

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 1ecd467..030fe05 100644 (file)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2272,7 +2272,7 @@ pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
 {
        enum dma_status ret;
        unsigned long flags;
-       struct dma_pl330_desc *desc, *running = NULL;
+       struct dma_pl330_desc *desc, *running = NULL, *last_enq = NULL;
        struct dma_pl330_chan *pch = to_pchan(chan);
        unsigned int transferred, residual = 0;
 
@@ -2285,10 +2285,13 @@ pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
                goto out;
 
        spin_lock_irqsave(&pch->lock, flags);
+       spin_lock(&pch->thread->dmac->lock);
 
        if (pch->thread->req_running != -1)
                running = pch->thread->req[pch->thread->req_running].desc;
 
+       last_enq = pch->thread->req[pch->thread->lstenq].desc;
+
        /* Check in pending list */
        list_for_each_entry(desc, &pch->work_list, node) {
                if (desc->status == DONE)
@@ -2296,6 +2299,15 @@ pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
                else if (running && desc == running)
                        transferred =
                                pl330_get_current_xferred_count(pch, desc);
+               else if (desc->status == BUSY)
+                       /*
+                        * Busy but not running means either just enqueued,
+                        * or finished and not yet marked done
+                        */
+                       if (desc == last_enq)
+                               transferred = 0;
+                       else
+                               transferred = desc->bytes_requested;
                else
                        transferred = 0;
                residual += desc->bytes_requested - transferred;
@@ -2316,6 +2328,7 @@ pl330_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
                if (desc->last)
                        residual = 0;
        }
+       spin_unlock(&pch->thread->dmac->lock);
        spin_unlock_irqrestore(&pch->lock, flags);
 
 out: