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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>
alistair/sunxi64-5.4-dsi
Peter Ujfalusi 2019-07-16 11:24:58 +03:00 committed by Vinod Koul
parent f4c255f1a7
commit aac8670369
1 changed files with 6 additions and 4 deletions
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10
drivers/dma/ti/omap-dma.c
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@ -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;