[PATCH 5.15 337/371] dmaengine: at_xdmac: Fix concurrency over chans completed_cookie

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From: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>

[ Upstream commit 506875c30fc5bf92246060bc3b4c38799646266b ]

Caller of dma_cookie_complete is expected to hold a lock to prevent
concurrency over the channel's completed cookie marker. Call
dma_cookie_complete() with the lock held.

Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver")
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211215110115.191749-5-tudor.ambarus@xxxxxxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/dma/at_xdmac.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index c5638afe94368..c6b200f0145ba 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1710,11 +1710,10 @@ static void at_xdmac_tasklet(struct tasklet_struct *t)
 		}
 
 		txd = &desc->tx_dma_desc;
-
+		dma_cookie_complete(txd);
 		at_xdmac_remove_xfer(atchan, desc);
 		spin_unlock_irq(&atchan->lock);
 
-		dma_cookie_complete(txd);
 		if (txd->flags & DMA_PREP_INTERRUPT)
 			dmaengine_desc_get_callback_invoke(txd, NULL);
 
-- 
2.39.2






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