dmaengine: ti: omap-dma: Readability cleanup in omap_dma_tx_status()

The tx_status is most likely going to be asked for the current transfer, so
check that first then try to fall back to lookup of non started transfers.

In this way the code is a bit more readable and in most cases we will avoid
to run vchan_find_desc() all the time.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20190716082459.1222-2-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/ti/omap-dma.c b/drivers/dma/ti/omap-dma.c
index 49da402a19278d15ec73dccf3dd0b6d6eff12b49..80fd2667b2c8f93c592bbddd81a599eb0b978ed5 100644 (file)
--- a/drivers/dma/ti/omap-dma.c
+++ b/drivers/dma/ti/omap-dma.c
@@ -833,10 +833,8 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
                return ret;
 
        spin_lock_irqsave(&c->vc.lock, flags);
-       vd = vchan_find_desc(&c->vc, cookie);
-       if (vd) {
-               txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx));
-       } else if (c->desc && c->desc->vd.tx.cookie == cookie) {
+
+       if (c->desc && c->desc->vd.tx.cookie == cookie) {
                struct omap_desc *d = c->desc;
                dma_addr_t pos;
 
@@ -848,11 +846,15 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
                        pos = 0;
 
                txstate->residue = omap_dma_desc_size_pos(d, pos);
+       } else if ((vd = vchan_find_desc(&c->vc, cookie))) {
+               txstate->residue = omap_dma_desc_size(to_omap_dma_desc(&vd->tx));
        } else {
                txstate->residue = 0;
        }
+
        if (ret == DMA_IN_PROGRESS && c->paused)
                ret = DMA_PAUSED;
+
        spin_unlock_irqrestore(&c->vc.lock, flags);
 
        return ret;