linux-kernel - [PATCH 1/3] dmaengine: ti: k3-udma: Correct completed descriptor's residue value

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Message-ID: <20191202203128.14348-2-peter.ujfalusi@ti.com>
Date:   Mon, 2 Dec 2019 22:31:26 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>
CC:     <dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <grygorii.strashko@...com>,
        <t-kristo@...com>, <tony@...mide.com>, <vigneshr@...com>
Subject: [PATCH 1/3] dmaengine: ti: k3-udma: Correct completed descriptor's residue value

The residue should show the number of _not_ completed bytes, so it has to
be 0 when the full transfer is completed.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/ti/k3-udma.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index c1450b0a8224..1b929f7a84d4 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -2784,13 +2784,14 @@ static void udma_desc_pre_callback(struct virt_dma_chan *vc,
 
 		if (cppi5_desc_get_type(desc_vaddr) ==
 		    CPPI5_INFO0_DESC_TYPE_VAL_HOST) {
-			result->residue = cppi5_hdesc_get_pktlen(desc_vaddr);
-			if (result->residue == d->residue)
-				result->result = DMA_TRANS_NOERROR;
-			else
+			result->residue = d->residue -
+					  cppi5_hdesc_get_pktlen(desc_vaddr);
+			if (result->residue)
 				result->result = DMA_TRANS_ABORTED;
+			else
+				result->result = DMA_TRANS_NOERROR;
 		} else {
-			result->residue = d->residue;
+			result->residue = 0;
 			result->result = DMA_TRANS_NOERROR;
 		}
 	}
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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