From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Williamson Subject: [PATCH] virtio_net: Cleanup command queue scatterlist usage Date: Mon, 27 Apr 2009 09:50:03 -0600 Message-ID: <20090427154925.4771.63651.stgit@debian.lart> References: <20090426.233014.216353908.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Return-path: Received: from g1t0029.austin.hp.com ([15.216.28.36]:9297 "EHLO g1t0029.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755421AbZD0P5D (ORCPT ); Mon, 27 Apr 2009 11:57:03 -0400 In-Reply-To: <20090426.233014.216353908.davem@davemloft.net> Sender: linux-next-owner@vger.kernel.org List-ID: To: davem@davemloft.net, rusty@rustcorp.com.au Cc: alex.williamson@hp.com, sfr@canb.auug.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-next@vger.kernel.org We were avoiding calling sg_init* on scatterlists passed into virtnet_send_command to prevent extraneous end markers. This caused build warnings for uninitialized variables. Cleanup the code to create proper scatterlists. Signed-off-by: Alex Williamson --- drivers/net/virtio_net.c | 16 ++++++++++------ 1 files changed, 10 insertions(+), 6 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 0718558..ed70df4 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -616,10 +616,11 @@ static int virtnet_open(struct net_device *dev) static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, struct scatterlist *data, int out, int in) { - struct scatterlist sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; + struct scatterlist *s, sg[VIRTNET_SEND_COMMAND_SG_MAX + 2]; struct virtio_net_ctrl_hdr ctrl; virtio_net_ctrl_ack status = ~0; unsigned int tmp; + int i; /* Caller should know better */ BUG_ON(!virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) || @@ -634,7 +635,8 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd, sg_init_table(sg, out + in); sg_set_buf(&sg[0], &ctrl, sizeof(ctrl)); - memcpy(&sg[1], data, sizeof(struct scatterlist) * (out + in - 2)); + for_each_sg(data, s, out + in - 2, i) + sg_set_buf(&sg[i + 1], sg_virt(s), s->length); sg_set_buf(&sg[out + in - 1], &status, sizeof(status)); BUG_ON(vi->cvq->vq_ops->add_buf(vi->cvq, sg, out, in, vi)); @@ -688,7 +690,7 @@ static void virtnet_set_rx_mode(struct net_device *dev) promisc = ((dev->flags & IFF_PROMISC) != 0); allmulti = ((dev->flags & IFF_ALLMULTI) != 0); - sg_set_buf(sg, &promisc, sizeof(promisc)); + sg_init_one(sg, &promisc, sizeof(promisc)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, VIRTIO_NET_CTRL_RX_PROMISC, @@ -696,7 +698,7 @@ static void virtnet_set_rx_mode(struct net_device *dev) dev_warn(&dev->dev, "Failed to %sable promisc mode.\n", promisc ? "en" : "dis"); - sg_set_buf(sg, &allmulti, sizeof(allmulti)); + sg_init_one(sg, &allmulti, sizeof(allmulti)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_RX, VIRTIO_NET_CTRL_RX_ALLMULTI, @@ -712,6 +714,8 @@ static void virtnet_set_rx_mode(struct net_device *dev) return; } + sg_init_table(sg, 2); + /* Store the unicast list and count in the front of the buffer */ mac_data->entries = dev->uc_count; addr = dev->uc_list; @@ -745,7 +749,7 @@ static void virnet_vlan_rx_add_vid(struct net_device *dev, u16 vid) struct virtnet_info *vi = netdev_priv(dev); struct scatterlist sg; - sg_set_buf(&sg, &vid, sizeof(vid)); + sg_init_one(&sg, &vid, sizeof(vid)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, VIRTIO_NET_CTRL_VLAN_ADD, &sg, 1, 0)) @@ -757,7 +761,7 @@ static void virnet_vlan_rx_kill_vid(struct net_device *dev, u16 vid) struct virtnet_info *vi = netdev_priv(dev); struct scatterlist sg; - sg_set_buf(&sg, &vid, sizeof(vid)); + sg_init_one(&sg, &vid, sizeof(vid)); if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_VLAN, VIRTIO_NET_CTRL_VLAN_DEL, &sg, 1, 0))