linux-kernel - [PATCH v2 6/6] dmaengine: ti: k3-udma: Fix terminated transfer handling

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Date:   Fri, 14 Feb 2020 11:14:41 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <vkoul@...nel.org>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dan.j.williams@...el.com>, <grygorii.strashko@...com>,
        <vigneshr@...com>
Subject: [PATCH v2 6/6] dmaengine: ti: k3-udma: Fix terminated transfer handling

When we receive back the descriptor of the terminated transfer the cookie
must be marked as completed to make sure that the accounting is correct.

In udma_tx_status() the status should be marked as completed if the channel
is no longer running (it can only happen if the channel is not yet started
for the first time, or after a channel termination).

Fixes: 25dcb5dd7b7ce ("dmaengine: ti: New driver for K3 UDMA")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 drivers/dma/ti/k3-udma.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/dma/ti/k3-udma.c b/drivers/dma/ti/k3-udma.c
index 9b4e1e5fa849..0536866a58ce 100644
--- a/drivers/dma/ti/k3-udma.c
+++ b/drivers/dma/ti/k3-udma.c
@@ -1097,29 +1097,27 @@ static irqreturn_t udma_ring_irq_handler(int irq, void *data)
 			goto out;
 		}
 
-		if (uc->cyclic) {
-			/* push the descriptor back to the ring */
-			if (d == uc->desc) {
+		if (d == uc->desc) {
+			/* active descriptor */
+			if (uc->cyclic) {
 				udma_cyclic_packet_elapsed(uc);
 				vchan_cyclic_callback(&d->vd);
-			}
-		} else {
-			bool desc_done = false;
-
-			if (d == uc->desc) {
-				desc_done = udma_is_desc_really_done(uc, d);
-
-				if (desc_done) {
+			} else {
+				if (udma_is_desc_really_done(uc, d)) {
 					uc->bcnt += d->residue;
 					udma_start(uc);
+					vchan_cookie_complete(&d->vd);
 				} else {
 					schedule_delayed_work(&uc->tx_drain.work,
 							      0);
 				}
 			}
-
-			if (desc_done)
-				vchan_cookie_complete(&d->vd);
+		} else {
+			/*
+			 * terminated descriptor, mark the descriptor as
+			 * completed to update the channel's cookie marker
+			 */
+			dma_cookie_complete(&d->vd.tx);
 		}
 	}
 out:
@@ -2769,6 +2767,9 @@ static enum dma_status udma_tx_status(struct dma_chan *chan,
 
 	ret = dma_cookie_status(chan, cookie, txstate);
 
+	if (!udma_is_chan_running(uc))
+		ret = DMA_COMPLETE;
+
 	if (ret == DMA_IN_PROGRESS && udma_is_chan_paused(uc))
 		ret = DMA_PAUSED;
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki