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[06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie

Message ID 20211116112036.96349-7-tudor.ambarus@microchip.com (mailing list archive)
State New, archived
Headers show
Series dmaengine: at_xdmac: Various fixes | expand

Commit Message

Tudor Ambarus Nov. 16, 2021, 11:20 a.m. UTC 
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@microchip.com>
---
 drivers/dma/at_xdmac.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
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Patch

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);