From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8E4C311703 for ; Mon, 21 Aug 2023 19:55:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0EFBBC433C8; Mon, 21 Aug 2023 19:55:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1692647717; bh=7hwvDBACKTflcEs4feTvTnJvGuY6kcnlAwwUj9pVOpU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ngj3ZQLX1vKpt6YaK+Y9CKhIs/KajW9tQwTcNTBvIYYPLNZ9wBXNO5OOTytOv/UGy oxU1vZvYip/vXerp061Iya2BzHV58nCk+soMwC3XdBOwoZGCELQ6qN7W+CJq3XYvmj OBneJ2qOFFC7AYXAgfyYWRbNwldm1Rv4fAvTDazc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dragos Tatulea , "Michael S. Tsirkin" , Jason Wang , "David S. Miller" , Sasha Levin Subject: [PATCH 6.1 113/194] virtio-net: set queues after driver_ok Date: Mon, 21 Aug 2023 21:41:32 +0200 Message-ID: <20230821194127.662940648@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230821194122.695845670@linuxfoundation.org> References: <20230821194122.695845670@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Jason Wang [ Upstream commit 51b813176f098ff61bd2833f627f5319ead098a5 ] Commit 25266128fe16 ("virtio-net: fix race between set queues and probe") tries to fix the race between set queues and probe by calling _virtnet_set_queues() before DRIVER_OK is set. This violates virtio spec. Fixing this by setting queues after virtio_device_ready(). Note that rtnl needs to be held for userspace requests to change the number of queues. So we are serialized in this way. Fixes: 25266128fe16 ("virtio-net: fix race between set queues and probe") Reported-by: Dragos Tatulea Acked-by: Michael S. Tsirkin Signed-off-by: Jason Wang Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/net/virtio_net.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index b7a4df4bab817..55c20ccb791ea 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -3942,8 +3942,6 @@ static int virtnet_probe(struct virtio_device *vdev) if (vi->has_rss || vi->has_rss_hash_report) virtnet_init_default_rss(vi); - _virtnet_set_queues(vi, vi->curr_queue_pairs); - /* serialize netdev register + virtio_device_ready() with ndo_open() */ rtnl_lock(); @@ -3956,6 +3954,8 @@ static int virtnet_probe(struct virtio_device *vdev) virtio_device_ready(vdev); + _virtnet_set_queues(vi, vi->curr_queue_pairs); + /* a random MAC address has been assigned, notify the device. * We don't fail probe if VIRTIO_NET_F_CTRL_MAC_ADDR is not there * because many devices work fine without getting MAC explicitly -- 2.40.1