diff options
| author | Veaceslav Falico <vfalico@redhat.com> | 2013-03-11 00:21:48 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-28 12:05:59 -0700 |
| commit | 0f4bab2da773a765a4025189bb6fb2ffacccf91a (patch) | |
| tree | 4da41bd86a9a420b091f9e65bce1fb95499e9323 | |
| parent | c8b46f44552cbf67460fba1c13edcba3339b1c76 (diff) | |
netconsole: don't call __netpoll_cleanup() while atomic
[ Upstream commit 3f315bef23075ea8a98a6fe4221a83b83456d970 ]
__netpoll_cleanup() is called in netconsole_netdev_event() while holding a
spinlock. Release/acquire the spinlock before/after it and restart the
loop. Also, disable the netconsole completely, because we won't have chance
after the restart of the loop, and might end up in a situation where
nt->enabled == 1 and nt->np.dev == NULL.
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/net/netconsole.c | 20 |
1 files changed, 9 insertions, 11 deletions
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index 4309296e865..8824dd41a5a 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -630,6 +630,7 @@ static int netconsole_netdev_event(struct notifier_block *this, goto done; spin_lock_irqsave(&target_list_lock, flags); +restart: list_for_each_entry(nt, &target_list, list) { netconsole_target_get(nt); if (nt->np.dev == dev) { @@ -642,20 +643,17 @@ static int netconsole_netdev_event(struct notifier_block *this, case NETDEV_UNREGISTER: /* * rtnl_lock already held + * we might sleep in __netpoll_cleanup() */ - if (nt->np.dev) { - spin_unlock_irqrestore( - &target_list_lock, - flags); - __netpoll_cleanup(&nt->np); - spin_lock_irqsave(&target_list_lock, - flags); - dev_put(nt->np.dev); - nt->np.dev = NULL; - } + spin_unlock_irqrestore(&target_list_lock, flags); + __netpoll_cleanup(&nt->np); + spin_lock_irqsave(&target_list_lock, flags); + dev_put(nt->np.dev); + nt->np.dev = NULL; nt->enabled = 0; stopped = true; - break; + netconsole_target_put(nt); + goto restart; } } netconsole_target_put(nt); |