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| author | Eric Dumazet <edumazet@google.com> | 2019-05-16 18:09:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-05-17 00:25:58 +0300 |
| commit | d7c04b05c9ca14c55309eb139430283a45c4c25f (patch) | |
| tree | 430f3db330f5830a4ccbfb0747d605b2c9ca43fa /net | |
| parent | e3a9f61b7ec3fd49227c3558d5ea897b75212871 (diff) | |
| download | linux-d7c04b05c9ca14c55309eb139430283a45c4c25f.tar.xz | |
net: avoid weird emergency message
When host is under high stress, it is very possible thread
running netdev_wait_allrefs() returns from msleep(250)
10 seconds late.
This leads to these messages in the syslog :
[...] unregister_netdevice: waiting for syz_tun to become free. Usage count = 0
If the device refcount is zero, the wait is over.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/dev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index 108ac8137b9b..b6b8505cfb3e 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -8927,7 +8927,7 @@ static void netdev_wait_allrefs(struct net_device *dev) refcnt = netdev_refcnt_read(dev); - if (time_after(jiffies, warning_time + 10 * HZ)) { + if (refcnt && time_after(jiffies, warning_time + 10 * HZ)) { pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n", dev->name, refcnt); warning_time = jiffies; |