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netvsc: need rcu_derefence when accessing internal device info 

The netvsc_device structure should be accessed by rcu_dereference
in the send path.  Change arguments to netvsc_send() to make
this easier to do correctly.

Remove no longer needed hv_device_to_netvsc_device.

Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2017-07-19 11:53:17 -07:00 committed by David S. Miller
parent 9749fed5d4
commit 2a926f7912
4 changed files with 11 additions and 13 deletions
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10
drivers/net/hyperv/hyperv_net.h
View File

@ -183,10 +183,12 @@ struct rndis_device {
/* Interface */
struct rndis_message;
struct netvsc_device;
struct net_device_context;
struct netvsc_device *netvsc_device_add(struct hv_device *device,
const struct netvsc_device_info *info);
void netvsc_device_remove(struct hv_device *device);
int netvsc_send(struct hv_device *device,
int netvsc_send(struct net_device_context *ndc,
struct hv_netvsc_packet *packet,
struct rndis_message *rndis_msg,
struct hv_page_buffer **page_buffer,
@ -790,12 +792,6 @@ net_device_to_netvsc_device(struct net_device *ndev)
return ((struct net_device_context *)netdev_priv(ndev))->nvdev;
}
static inline struct netvsc_device *
hv_device_to_netvsc_device(struct hv_device *device)
{
return net_device_to_netvsc_device(hv_get_drvdata(device));
}
/* NdisInitialize message */
struct rndis_initialize_request {
u32 req_id;

8
drivers/net/hyperv/netvsc.c
View File

@ -822,13 +822,15 @@ static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
msdp->count = 0;
}
int netvsc_send(struct hv_device *device,
/* RCU already held by caller */
int netvsc_send(struct net_device_context *ndev_ctx,
struct hv_netvsc_packet *packet,
struct rndis_message *rndis_msg,
struct hv_page_buffer **pb,
struct sk_buff *skb)
{
struct netvsc_device *net_device = hv_device_to_netvsc_device(device);
struct netvsc_device *net_device = rcu_dereference(ndev_ctx->nvdev);
struct hv_device *device = ndev_ctx->device_ctx;
int ret = 0;
struct netvsc_channel *nvchan;
u32 pktlen = packet->total_data_buflen, msd_len = 0;
@ -840,7 +842,7 @@ int netvsc_send(struct hv_device *device,
bool xmit_more = (skb != NULL) ? skb->xmit_more : false;
/* If device is rescinded, return error and packet will get dropped. */
if (unlikely(net_device->destroy))
if (unlikely(!net_device || net_device->destroy))
return -ENODEV;
/* We may race with netvsc_connect_vsp()/netvsc_init_buf() and get

4
drivers/net/hyperv/netvsc_drv.c
View File

@ -505,8 +505,8 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net)
/* timestamp packet in software */
skb_tx_timestamp(skb);
ret = netvsc_send(net_device_ctx->device_ctx, packet,
rndis_msg, &pb, skb);
ret = netvsc_send(net_device_ctx, packet, rndis_msg, &pb, skb);
if (likely(ret == 0))
return NETDEV_TX_OK;

2
drivers/net/hyperv/rndis_filter.c
View File

@ -243,7 +243,7 @@ static int rndis_filter_send_request(struct rndis_device *dev,
pb[0].len;
}
ret = netvsc_send(net_device_ctx->device_ctx, packet, NULL, &pb, NULL);
ret = netvsc_send(net_device_ctx, packet, NULL, &pb, NULL);
return ret;
}