diff options
| author | Tim Gardner <timg@tpi.com> | 2011-04-20 09:00:49 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-04-21 21:04:32 -0700 |
| commit | cb771838715b1c470bc5735bdae709b33b18e0ad (patch) | |
| tree | 9de4b9a992aa2a521bfba73b941310dd8e09ea60 /drivers/net/atl1c/atl1c_main.c | |
| parent | e74fbd030223e29d269f4be17e3dce6de38f4c28 (diff) | |
atl1c: Fix work event interrupt/task races
The mechanism used to initiate work events from the interrupt
handler has a classic read/modify/write race between the interrupt
handler that sets the condition, and the worker task that reads and
clears the condition. Close these races by using atomic
bit fields.
Cc: stable@kernel.org
Cc: Jie Yang <jie.yang@atheros.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/atl1c/atl1c_main.c')
| -rw-r--r-- | drivers/net/atl1c/atl1c_main.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/drivers/net/atl1c/atl1c_main.c b/drivers/net/atl1c/atl1c_main.c index 7d9d5067a65c..a6e1c36e48e6 100644 --- a/drivers/net/atl1c/atl1c_main.c +++ b/drivers/net/atl1c/atl1c_main.c @@ -325,7 +325,7 @@ static void atl1c_link_chg_event(struct atl1c_adapter *adapter) } } - adapter->work_event |= ATL1C_WORK_EVENT_LINK_CHANGE; + set_bit(ATL1C_WORK_EVENT_LINK_CHANGE, &adapter->work_event); schedule_work(&adapter->common_task); } @@ -337,20 +337,16 @@ static void atl1c_common_task(struct work_struct *work) adapter = container_of(work, struct atl1c_adapter, common_task); netdev = adapter->netdev; - if (adapter->work_event & ATL1C_WORK_EVENT_RESET) { - adapter->work_event &= ~ATL1C_WORK_EVENT_RESET; + if (test_and_clear_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event)) { netif_device_detach(netdev); atl1c_down(adapter); atl1c_up(adapter); netif_device_attach(netdev); - return; } - if (adapter->work_event & ATL1C_WORK_EVENT_LINK_CHANGE) { - adapter->work_event &= ~ATL1C_WORK_EVENT_LINK_CHANGE; + if (test_and_clear_bit(ATL1C_WORK_EVENT_LINK_CHANGE, + &adapter->work_event)) atl1c_check_link_status(adapter); - } - return; } @@ -369,7 +365,7 @@ static void atl1c_tx_timeout(struct net_device *netdev) struct atl1c_adapter *adapter = netdev_priv(netdev); /* Do the reset outside of interrupt context */ - adapter->work_event |= ATL1C_WORK_EVENT_RESET; + set_bit(ATL1C_WORK_EVENT_RESET, &adapter->work_event); schedule_work(&adapter->common_task); } |