linux-kernel - [PATCH net-next] io_uring/zcrx: fix ifq->if_rxq is -1, get dma

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Message-Id: <20250912083930.16704-1-zhoufeng.zf@bytedance.com>
Date: Fri, 12 Sep 2025 16:39:30 +0800
From: Feng zhou <zhoufeng.zf@...edance.com>
To: axboe@...nel.dk,
	asml.silence@...il.com,
	almasrymina@...gle.com,
	kuba@...nel.org,
	dtatulea@...dia.com
Cc: io-uring@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	yangzhenze@...edance.com,
	wangdongdong.6@...edance.com,
	zhoufeng.zf@...edance.com
Subject: [PATCH net-next] io_uring/zcrx: fix ifq->if_rxq is -1, get dma_dev is NULL

From: Feng Zhou <zhoufeng.zf@...edance.com>

ifq->if_rxq has not been assigned, is -1, the correct value is
in reg.if_rxq.

Fixes: 59b8b32ac8d469958936fcea781c7f58e3d64742 ("io_uring/zcrx: add support for custom DMA devices")
Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>
---
 io_uring/zcrx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/io_uring/zcrx.c b/io_uring/zcrx.c
index 319eddfd30e0..3639283c87ca 100644
--- a/io_uring/zcrx.c
+++ b/io_uring/zcrx.c
@@ -600,7 +600,7 @@ int io_register_zcrx_ifq(struct io_ring_ctx *ctx,
 		goto err;
 	}
 
-	ifq->dev = netdev_queue_get_dma_dev(ifq->netdev, ifq->if_rxq);
+	ifq->dev = netdev_queue_get_dma_dev(ifq->netdev, reg.if_rxq);
 	if (!ifq->dev) {
 		ret = -EOPNOTSUPP;
 		goto err;
-- 
2.30.2