linux-kernel - [PATCH] net: ethernet: sun4i-emac: free dma descriptor

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Message-ID: <tencent_160BBED8A83CECDE110A344B51B6229B1209@qq.com>
Date: Wed,  3 Sep 2025 15:49:39 +0800
From: Conley Lee <conleylee@...mail.com>
To: kuba@...nel.org,
	davem@...emloft.net,
	wens@...e.org,
	mripard@...nel.org
Cc: netdev@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Conley Lee <conleylee@...mail.com>
Subject: [PATCH] net: ethernet: sun4i-emac: free dma descriptor

In the current implementation of the sun4i-emac driver, when using DMA to
receive data packets, the descriptor for the current DMA request is not
released in the rx_done_callback.

Fix this by properly releasing the descriptor.

Fixes: 47869e82c8b8 ("sun4i-emac.c: add dma support")
Signed-off-by: Conley Lee <conleylee@...mail.com>
---
 drivers/net/ethernet/allwinner/sun4i-emac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
index 2f516b950..2f990d0a5 100644
--- a/drivers/net/ethernet/allwinner/sun4i-emac.c
+++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
@@ -237,6 +237,7 @@ emac_alloc_dma_req(struct emac_board_info *db,
 
 static void emac_free_dma_req(struct emac_dma_req *req)
 {
+	dmaengine_desc_free(req->desc);
 	kfree(req);
 }
 
-- 
2.25.1