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| author | Eric Dumazet <edumazet@google.com> | 2013-02-19 10:42:03 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-19 14:33:55 -0500 |
| commit | 303c07db487be59ae9fda10600ea65ca11c21497 (patch) | |
| tree | 23a66e53bed3b6f8093d815890388b9057760bd9 /drivers/net/ppp/ppp_generic.c | |
| parent | 7cb08d7f3a5ea6131f4f243c2080530ac41cb293 (diff) | |
| download | op-kernel-dev-303c07db487be59ae9fda10600ea65ca11c21497.zip op-kernel-dev-303c07db487be59ae9fda10600ea65ca11c21497.tar.gz | |
ppp: set qdisc_tx_busylock to avoid LOCKDEP splat
If a qdisc is installed on a ppp device, its possible to get
a lockdep splat under stress, because nested dev_queue_xmit() can
lock busylock a second time (on a different device, so its a false
positive)
Avoid this problem using a distinct lock_class_key for ppp
devices.
Reported-by: Yanko Kaneti <yaneti@declera.com>
Tested-by: Yanko Kaneti <yaneti@declera.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ppp/ppp_generic.c')
| -rw-r--r-- | drivers/net/ppp/ppp_generic.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/ppp/ppp_generic.c b/drivers/net/ppp/ppp_generic.c index 4fd754e..3db9131 100644 --- a/drivers/net/ppp/ppp_generic.c +++ b/drivers/net/ppp/ppp_generic.c @@ -1058,7 +1058,15 @@ ppp_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats64) return stats64; } +static struct lock_class_key ppp_tx_busylock; +static int ppp_dev_init(struct net_device *dev) +{ + dev->qdisc_tx_busylock = &ppp_tx_busylock; + return 0; +} + static const struct net_device_ops ppp_netdev_ops = { + .ndo_init = ppp_dev_init, .ndo_start_xmit = ppp_start_xmit, .ndo_do_ioctl = ppp_net_ioctl, .ndo_get_stats64 = ppp_get_stats64, |
