[PATCH v3 04/12] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie

Tudor Ambarus
2021-12-15T11:01:35Z

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@microchip.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 7d3560acedbb..83c031207530 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