From 9079ce691255792009c446d8c3382507b8d38635 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Thu, 16 Jun 2011 13:16:37 -0700 Subject: [PATCH] Staging: hv: netvsc: Fix a bug in accounting transmit slots The transmit slots were manipulated without proper locking. Fix this bug by making the variable tracking the transmit slots atomic. This patch should be ported to prior stable kernels 2.6.32 and later. Signed-off-by: K. Y. Srinivasan Signed-off-by: Haiyang Zhang Signed-off-by: Hank Janssen Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/staging/hv/netvsc_drv.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/drivers/staging/hv/netvsc_drv.c b/drivers/staging/hv/netvsc_drv.c index 33cab9c9949e..38ca2c2c4390 100644 --- a/drivers/staging/hv/netvsc_drv.c +++ b/drivers/staging/hv/netvsc_drv.c @@ -21,6 +21,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include +#include #include #include #include @@ -45,7 +46,7 @@ struct net_device_context { /* point back to our device context */ struct hv_device *device_ctx; - unsigned long avail; + atomic_t avail; struct delayed_work dwork; }; @@ -118,8 +119,9 @@ static void netvsc_xmit_completion(void *context) dev_kfree_skb_any(skb); - net_device_ctx->avail += num_pages; - if (net_device_ctx->avail >= PACKET_PAGES_HIWATER) + atomic_add(num_pages, &net_device_ctx->avail); + if (atomic_read(&net_device_ctx->avail) >= + PACKET_PAGES_HIWATER) netif_wake_queue(net); } } @@ -133,7 +135,7 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) /* Add 1 for skb->data and additional one for RNDIS */ num_pages = skb_shinfo(skb)->nr_frags + 1 + 1; - if (num_pages > net_device_ctx->avail) + if (num_pages > atomic_read(&net_device_ctx->avail)) return NETDEV_TX_BUSY; /* Allocate a netvsc packet based on # of frags. */ @@ -185,8 +187,8 @@ static int netvsc_start_xmit(struct sk_buff *skb, struct net_device *net) net->stats.tx_bytes += skb->len; net->stats.tx_packets++; - net_device_ctx->avail -= num_pages; - if (net_device_ctx->avail < PACKET_PAGES_LOWATER) + atomic_sub(num_pages, &net_device_ctx->avail); + if (atomic_read(&net_device_ctx->avail) < PACKET_PAGES_LOWATER) netif_stop_queue(net); } else { /* we are shutting down or bus overloaded, just drop packet */ @@ -345,7 +347,7 @@ static int netvsc_probe(struct hv_device *dev) net_device_ctx = netdev_priv(net); net_device_ctx->device_ctx = dev; - net_device_ctx->avail = ring_size; + atomic_set(&net_device_ctx->avail, ring_size); dev_set_drvdata(&dev->device, net); INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_send_garp); -- 2.34.1