diff mbox series

[v2,09/32] dmaengine: at_hdmac: Free the memset buf without holding the chan lock

Message ID 20221025090306.297886-10-tudor.ambarus@microchip.com (mailing list archive)
State Changes Requested
Headers show
Series dmaengine: at_hdmac: Fix concurrency bugs and then convert to virt-dma | expand

Commit Message

Tudor Ambarus Oct. 25, 2022, 9:02 a.m. UTC 
There's no need to hold the channel lock when freeing the memset buf, as
the operation has already completed. Free the memset buf without holding
the channel lock.

Fixes: 4d112426c344 ("dmaengine: hdmac: Add memset capabilities")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Cc: stable@vger.kernel.org
---
 drivers/dma/at_hdmac.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 2012ecc57826..0fb44f622d35 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -462,13 +462,6 @@  atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
 	if (!atc_chan_is_cyclic(atchan))
 		dma_cookie_complete(txd);
 
-	/* If the transfer was a memset, free our temporary buffer */
-	if (desc->memset_buffer) {
-		dma_pool_free(atdma->memset_pool, desc->memset_vaddr,
-			      desc->memset_paddr);
-		desc->memset_buffer = false;
-	}
-
 	/* Remove transfer node from the active list. */
 	list_del_init(&desc->desc_node);
 	spin_unlock_irqrestore(&atchan->lock, flags);
@@ -487,6 +480,13 @@  atc_chain_complete(struct at_dma_chan *atchan, struct at_desc *desc)
 	/* add myself to free_list */
 	list_add(&desc->desc_node, &atchan->free_list);
 	spin_unlock_irqrestore(&atchan->lock, flags);
+
+	/* If the transfer was a memset, free our temporary buffer */
+	if (desc->memset_buffer) {
+		dma_pool_free(atdma->memset_pool, desc->memset_vaddr,
+			      desc->memset_paddr);
+		desc->memset_buffer = false;
+	}
 }
 
 /**