From: Feng Zhou <zhoufeng.zf@bytedance.com>
Date: Fri, 12 Sep 2025 14:01:33 +0000 (+0800)
Subject: io_uring/zcrx: fix ifq->if_rxq is -1, get dma_dev is NULL
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=3a0ac202534bcd397e6fd744b6d1038d372c5b5e;p=users%2Fhch%2Fmisc.git

io_uring/zcrx: fix ifq->if_rxq is -1, get dma_dev is NULL

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@bytedance.com>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Link: https://patch.msgid.link/20250912140133.97741-1-zhoufeng.zf@bytedance.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

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;