From 3544d2878817bd139dda238cdd86a15e1c03d037 Mon Sep 17 00:00:00 2001 From: Muhammad Hamza Farooq Date: Thu, 30 Jun 2016 17:15:15 +0200 Subject: [PATCH] dmaengine: rcar-dmac: use result of updated get_residue in tx_status MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit The hardware might have complete the transfer but the interrupt handler might not have had a chance to run. If rcar_dmac_chan_get_residue() which reads HW registers finds that there is no residue return DMA_COMPLETE. Signed-off-by: Muhammad Hamza Farooq Signed-off-by: Geert Uytterhoeven [Niklas: add explanation in commit message] Signed-off-by: Niklas Söderlund Acked-by: Laurent Pinchart Signed-off-by: Vinod Koul --- drivers/dma/sh/rcar-dmac.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/dma/sh/rcar-dmac.c b/drivers/dma/sh/rcar-dmac.c index 433e98260414..74c9563222bc 100644 --- a/drivers/dma/sh/rcar-dmac.c +++ b/drivers/dma/sh/rcar-dmac.c @@ -1202,6 +1202,10 @@ static enum dma_status rcar_dmac_tx_status(struct dma_chan *chan, residue = rcar_dmac_chan_get_residue(rchan, cookie); spin_unlock_irqrestore(&rchan->lock, flags); + /* if there's no residue, the cookie is complete */ + if (!residue) + return DMA_COMPLETE; + dma_set_residue(txstate, residue); return status; -- 2.20.1