linux-kernel - [PATCH v2 06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed

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Message-ID: <20211125090028.786832-7-tudor.ambarus@microchip.com>
Date:   Thu, 25 Nov 2021 11:00:21 +0200
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <ludovic.desroches@...rochip.com>, <vkoul@...nel.org>,
        <richard.genoud@...il.com>, <gregkh@...uxfoundation.org>,
        <jirislaby@...nel.org>
CC:     <nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
        <mripard@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-serial@...r.kernel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH v2 06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie

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

Fixes: e1f7c9eee707 ("dmaengine: at_xdmac: creation of the atmel eXtended DMA Controller driver")
Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
---
 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 b45ae4fee9db..4d8476845c20 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1703,11 +1703,10 @@ 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);
 
-- 
2.25.1