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r8169: fix Rx index race between FIFO overflow recovery and NAPI handler.

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Since 92fc43b415, rtl8169_tx_timeout ends up
resetting Rx and Tx indexes and thus racing with the NAPI handler via
-> rtl8169_hw_reset
   -> rtl_hw_reset
      -> rtl8169_init_ring_indexes

What about returning to the original state ?

rtl_hw_reset is only used by rtl8169_hw_reset and rtl8169_init_one.

The latter does not need rtl8169_init_ring_indexes because the indexes
still contain their original values from the newly allocated network
device private data area (i.e. 0).

rtl8169_hw_reset is used by:
1. rtl8169_down
   Helper for rtl8169_close. rtl8169_open explicitely inits the indexes
   anyway.
2. rtl8169_pcierr_interrupt
   Indexes are set by rtl8169_reinit_task.
3. rtl8169_interrupt
   rtl8169_hw_reset is needed when the device goes down. See 1.
4. rtl_shutdown
   System shutdown handler. Indexes are irrelevant.
5. rtl8169_reset_task
   Indexes must be set before rtl_hw_start is called.
6. rtl8169_tx_timeout
   Indexes should not be set. This is the job of rtl8169_reset_task anyway.

The removal of rtl8169_hw_reset in rtl8169_tx_timeout and its move in
rtl8169_reset_task do not change the analysis.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Cc: hayeswang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
françois romieu 2011-12-04 20:30:52 +00:00 committed by David S. Miller
parent 811fd3010c
commit c7c2c39be8
1 changed files with 3 additions and 8 deletions
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11
drivers/net/ethernet/realtek/r8169.c
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@ -3935,8 +3935,6 @@ static void rtl_hw_reset(struct rtl8169_private *tp)
break;
udelay(100);
}
rtl8169_init_ring_indexes(tp);
}
static int __devinit
@ -5395,14 +5393,16 @@ static void rtl8169_reset_task(struct work_struct *work)
if (!netif_running(dev))
goto out_unlock;
rtl8169_hw_reset(tp);
rtl8169_wait_for_quiescence(dev);
for (i = 0; i < NUM_RX_DESC; i++)
rtl8169_mark_to_asic(tp->RxDescArray + i, rx_buf_sz);
rtl8169_tx_clear(tp);
rtl8169_init_ring_indexes(tp);
rtl8169_hw_reset(tp);
rtl_hw_start(dev);
netif_wake_queue(dev);
rtl8169_check_link_status(dev, tp, tp->mmio_addr);
@ -5413,11 +5413,6 @@ static void rtl8169_reset_task(struct work_struct *work)
static void rtl8169_tx_timeout(struct net_device *dev)
{
struct rtl8169_private *tp = netdev_priv(dev);
rtl8169_hw_reset(tp);
/* Let's wait a bit while any (async) irq lands on */
rtl8169_schedule_work(dev, rtl8169_reset_task);
}