[PATCH AUTOSEL 6.13 13/16] net: devmem: do not WARN conditionally after netdev_rx_queue_restart()

[Sasha Levin <sashal@kernel.org>]

From: Taehee Yoo <ap420073@gmail.com>

[ Upstream commit a70f891e0fa0435379ad4950e156a15a4ef88b4d ]

When devmem socket is closed, netdev_rx_queue_restart() is called to
reset queue by the net_devmem_unbind_dmabuf(). But callback may return
-ENETDOWN if the interface is down because queues are already freed
when the interface is down so queue reset is not needed.
So, it should not warn if the return value is -ENETDOWN.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Reviewed-by: Mina Almasry <almasrymina@google.com>
Link: https://patch.msgid.link/20250309134219.91670-8-ap420073@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/core/devmem.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/devmem.c b/net/core/devmem.c
index 11b91c12ee113..17f8a83a5ee74 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -108,6 +108,7 @@ void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding)
 	struct netdev_rx_queue *rxq;
 	unsigned long xa_idx;
 	unsigned int rxq_idx;
+	int err;
 
 	if (binding->list.next)
 		list_del(&binding->list);
@@ -119,7 +120,8 @@ void net_devmem_unbind_dmabuf(struct net_devmem_dmabuf_binding *binding)
 
 		rxq_idx = get_netdev_rx_queue_index(rxq);
 
-		WARN_ON(netdev_rx_queue_restart(binding->dev, rxq_idx));
+		err = netdev_rx_queue_restart(binding->dev, rxq_idx);
+		WARN_ON(err && err != -ENETDOWN);
 	}
 
 	xa_erase(&net_devmem_dmabuf_bindings, binding->id);
-- 
2.39.5