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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 <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan 2011-06-16 13:16:37 -07:00 committed by Greg Kroah-Hartman
parent 46d2eb6d82
commit 9079ce6912
1 changed files with 9 additions and 7 deletions
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16
drivers/staging/hv/netvsc_drv.c
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@ -21,6 +21,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/init.h>
#include <linux/atomic.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/device.h>
@ -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);