提交 338c15e4 编写于 作者: J Jesse Brandeburg 提交者: David S. Miller

e1000: fix occasional panic on unload

Net drivers in general have an issue where timers fired
by mod_timer or work threads with schedule_work are running
outside of the rtnl_lock.

With no other lock protection these routines are vulnerable
to races with driver unload or reset paths.

The longer term solution to this might be a redesign with
safer locks being taken in the driver to guarantee no
reentrance, but for now a safe and effective fix is
to take the rtnl_lock in these routines.
Signed-off-by: NJesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: NJeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 5cf42fcd
......@@ -521,8 +521,21 @@ void e1000_down(struct e1000_adapter *adapter)
e1000_clean_all_rx_rings(adapter);
}
void e1000_reinit_safe(struct e1000_adapter *adapter)
{
while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
msleep(1);
rtnl_lock();
e1000_down(adapter);
e1000_up(adapter);
rtnl_unlock();
clear_bit(__E1000_RESETTING, &adapter->flags);
}
void e1000_reinit_locked(struct e1000_adapter *adapter)
{
/* if rtnl_lock is not held the call path is bogus */
ASSERT_RTNL();
WARN_ON(in_interrupt());
while (test_and_set_bit(__E1000_RESETTING, &adapter->flags))
msleep(1);
......@@ -2247,7 +2260,10 @@ static void e1000_update_phy_info_task(struct work_struct *work)
struct e1000_adapter,
phy_info_task);
struct e1000_hw *hw = &adapter->hw;
rtnl_lock();
e1000_phy_get_info(hw, &adapter->phy_info);
rtnl_unlock();
}
/**
......@@ -2273,6 +2289,7 @@ static void e1000_82547_tx_fifo_stall_task(struct work_struct *work)
struct net_device *netdev = adapter->netdev;
u32 tctl;
rtnl_lock();
if (atomic_read(&adapter->tx_fifo_stall)) {
if ((er32(TDT) == er32(TDH)) &&
(er32(TDFT) == er32(TDFH)) &&
......@@ -2293,6 +2310,7 @@ static void e1000_82547_tx_fifo_stall_task(struct work_struct *work)
mod_timer(&adapter->tx_fifo_stall_timer, jiffies + 1);
}
}
rtnl_unlock();
}
bool e1000_has_link(struct e1000_adapter *adapter)
......@@ -3160,7 +3178,7 @@ static void e1000_reset_task(struct work_struct *work)
struct e1000_adapter *adapter =
container_of(work, struct e1000_adapter, reset_task);
e1000_reinit_locked(adapter);
e1000_reinit_safe(adapter);
}
/**
......
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