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net-sysfs: Use rtnl_trylock in wireless sysfs methods.

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The wireless sysfs methods like the rest of the networking sysfs
methods are removed with the rtnl_lock held and block until
the existing methods stop executing.  So use rtnl_trylock
and restart_syscall so that the code continues to work.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman 2010-02-19 13:23:47 +00:00 committed by David S. Miller
parent 88af182e38
commit b8afe64161
1 changed files with 2 additions and 1 deletions
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3
net/core/net-sysfs.c
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@ -410,7 +410,8 @@ static ssize_t wireless_show(struct device *d, char *buf,
const struct iw_statistics *iw;
ssize_t ret = -EINVAL;
rtnl_lock();
if (!rtnl_trylock())
return restart_syscall();
if (dev_isalive(dev)) {
iw = get_wireless_stats(dev);
if (iw)