diff options
| author | Matt Carlson <mcarlson@broadcom.com> | 2011-11-04 10:15:04 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-11-04 22:31:48 +0100 |
| commit | 5b1906241905d9bd1abe920854b3d43c2b9c85e1 (patch) | |
| tree | d259390621daa923977f00fb43415a09da565cd5 | |
| parent | tg3: Schedule at most one tg3_reset_task run (diff) | |
| download | linux-5b1906241905d9bd1abe920854b3d43c2b9c85e1.tar.xz linux-5b1906241905d9bd1abe920854b3d43c2b9c85e1.zip | |
tg3: Eliminate timer race with reset_task
During shutdown, it is impossible to reliably disable the timer and
reset_task threads. Each thread can schedule the other, which leads to
shutdown code that chases its tail.
To fix the problem, this patch removes the ability of tg3_reset_task to
schedule a new timer thread. To support this change, tg3_timer no
longer terminates itself, but rather goes into a polling mode.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/broadcom/tg3.c | 14 | ||||
| -rw-r--r-- | drivers/net/ethernet/broadcom/tg3.h | 1 |
2 files changed, 2 insertions, 13 deletions
diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c index d4a85b795344..cc7349fd7fcd 100644 --- a/drivers/net/ethernet/broadcom/tg3.c +++ b/drivers/net/ethernet/broadcom/tg3.c @@ -6352,7 +6352,6 @@ static void tg3_reset_task(struct work_struct *work) { struct tg3 *tp = container_of(work, struct tg3, reset_task); int err; - unsigned int restart_timer; tg3_full_lock(tp, 0); @@ -6370,9 +6369,6 @@ static void tg3_reset_task(struct work_struct *work) tg3_full_lock(tp, 1); - restart_timer = tg3_flag(tp, RESTART_TIMER); - tg3_flag_clear(tp, RESTART_TIMER); - if (tg3_flag(tp, TX_RECOVERY_PENDING)) { tp->write32_tx_mbox = tg3_write32_tx_mbox; tp->write32_rx_mbox = tg3_write_flush_reg32; @@ -6387,9 +6383,6 @@ static void tg3_reset_task(struct work_struct *work) tg3_netif_start(tp); - if (restart_timer) - mod_timer(&tp->timer, jiffies + 1); - out: tg3_full_unlock(tp); @@ -9218,7 +9211,7 @@ static void tg3_timer(unsigned long __opaque) { struct tg3 *tp = (struct tg3 *) __opaque; - if (tp->irq_sync) + if (tp->irq_sync || tg3_flag(tp, RESET_TASK_PENDING)) goto restart_timer; spin_lock(&tp->lock); @@ -9241,10 +9234,9 @@ static void tg3_timer(unsigned long __opaque) } if (!(tr32(WDMAC_MODE) & WDMAC_MODE_ENABLE)) { - tg3_flag_set(tp, RESTART_TIMER); spin_unlock(&tp->lock); tg3_reset_task_schedule(tp); - return; + goto restart_timer; } } @@ -15847,12 +15839,10 @@ static pci_ers_result_t tg3_io_error_detected(struct pci_dev *pdev, tg3_netif_stop(tp); del_timer_sync(&tp->timer); - tg3_flag_clear(tp, RESTART_TIMER); /* Want to make sure that the reset task doesn't run */ tg3_reset_task_cancel(tp); tg3_flag_clear(tp, TX_RECOVERY_PENDING); - tg3_flag_clear(tp, RESTART_TIMER); netif_device_detach(netdev); diff --git a/drivers/net/ethernet/broadcom/tg3.h b/drivers/net/ethernet/broadcom/tg3.h index 610fd84cc60f..94b4bd049a33 100644 --- a/drivers/net/ethernet/broadcom/tg3.h +++ b/drivers/net/ethernet/broadcom/tg3.h @@ -2879,7 +2879,6 @@ enum TG3_FLAGS { TG3_FLAG_JUMBO_CAPABLE, TG3_FLAG_CHIP_RESETTING, TG3_FLAG_INIT_COMPLETE, - TG3_FLAG_RESTART_TIMER, TG3_FLAG_TSO_BUG, TG3_FLAG_IS_5788, TG3_FLAG_MAX_RXPEND_64, |