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Subject[PATCH 4.9 13/41] dmaengine: sh: rcar-dmac: With cyclic DMA residue 0 is valid
Date
From: Dirk Behme <dirk.behme@de.bosch.com>

commit 907bd68a2edc491849e2fdcfe52c4596627bca94 upstream.

Having a cyclic DMA, a residue 0 is not an indication of a completed
DMA. In case of cyclic DMA make sure that dma_set_residue() is called
and with this a residue of 0 is forwarded correctly to the caller.

Fixes: 3544d2878817 ("dmaengine: rcar-dmac: use result of updated get_residue in tx_status")
Signed-off-by: Dirk Behme <dirk.behme@de.bosch.com>
Signed-off-by: Achim Dahlhoff <Achim.Dahlhoff@de.bosch.com>
Signed-off-by: Hiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: Yao Lihua <ylhuajnu@outlook.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: <stable@vger.kernel.org> # v4.8+
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/dma/sh/rcar-dmac.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/dma/sh/rcar-dmac.c
+++ b/drivers/dma/sh/rcar-dmac.c
@@ -1311,6 +1311,7 @@ static enum dma_status rcar_dmac_tx_stat
enum dma_status status;
unsigned long flags;
unsigned int residue;
+ bool cyclic;

status = dma_cookie_status(chan, cookie, txstate);
if (status == DMA_COMPLETE || !txstate)
@@ -1318,10 +1319,11 @@ static enum dma_status rcar_dmac_tx_stat

spin_lock_irqsave(&rchan->lock, flags);
residue = rcar_dmac_chan_get_residue(rchan, cookie);
+ cyclic = rchan->desc.running ? rchan->desc.running->cyclic : false;
spin_unlock_irqrestore(&rchan->lock, flags);

/* if there's no residue, the cookie is complete */
- if (!residue)
+ if (!residue && !cyclic)
return DMA_COMPLETE;

dma_set_residue(txstate, residue);

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