diff options
| author | Jesse Brandeburg <jesse.brandeburg@intel.com> | 2010-09-22 22:22:42 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-24 01:33:38 +0400 |
| commit | 338c15e470d818f215d651505dc169d4e92f36a4 (patch) | |
| tree | 90153c4c54f0b43ed48700a396db695d232f1878 /drivers/net/e1000 | |
| parent | 5cf42fcda0fdddfe7f5ea8629cb7b820bf7e91ab (diff) | |
| download | linux-338c15e470d818f215d651505dc169d4e92f36a4.tar.xz | |
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: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/e1000')
| -rw-r--r-- | drivers/net/e1000/e1000_main.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c index 5b4c6c061414..c88439deb7d8 100644 --- a/drivers/net/e1000/e1000_main.c +++ b/drivers/net/e1000/e1000_main.c @@ -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); } /** |