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authorJesse Brandeburg <jesse.brandeburg@intel.com>2009-03-25 21:59:22 +0000
committerDavid S. Miller <davem@davemloft.net>2009-03-26 01:00:55 -0700
commita6c42322722976ca81e6d02e4a702f33d659d8fc (patch)
tree1f3a9a036b41edb32ee00cf6c0a972dfad80b18f /drivers/net/e1000
parentccfb342c5cd584f0f3e682280f7152310edf0e39 (diff)
downloadop-kernel-dev-a6c42322722976ca81e6d02e4a702f33d659d8fc.zip
op-kernel-dev-a6c42322722976ca81e6d02e4a702f33d659d8fc.tar.gz
e1000: fix close race with interrupt
this is in regards to http://bugzilla.kernel.org/show_bug.cgi?id=12876 where it appears that e1000 can leave its interrupt enabled after exiting the driver. Fix the bug by making the interrupt enable paths more aware of the driver exiting. Thanks to Alan Cox for the poke and initial investigation. CC: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@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.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 5c61b92..93b861d 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -577,12 +577,30 @@ out:
void e1000_down(struct e1000_adapter *adapter)
{
+ struct e1000_hw *hw = &adapter->hw;
struct net_device *netdev = adapter->netdev;
+ u32 rctl, tctl;
/* signal that we're down so the interrupt handler does not
* reschedule our watchdog timer */
set_bit(__E1000_DOWN, &adapter->flags);
+ /* disable receives in the hardware */
+ rctl = er32(RCTL);
+ ew32(RCTL, rctl & ~E1000_RCTL_EN);
+ /* flush and sleep below */
+
+ /* can be netif_tx_disable when NETIF_F_LLTX is removed */
+ netif_stop_queue(netdev);
+
+ /* disable transmits in the hardware */
+ tctl = er32(TCTL);
+ tctl &= ~E1000_TCTL_EN;
+ ew32(TCTL, tctl);
+ /* flush both disables and wait for them to finish */
+ E1000_WRITE_FLUSH();
+ msleep(10);
+
napi_disable(&adapter->napi);
e1000_irq_disable(adapter);
@@ -595,7 +613,6 @@ void e1000_down(struct e1000_adapter *adapter)
adapter->link_speed = 0;
adapter->link_duplex = 0;
netif_carrier_off(netdev);
- netif_stop_queue(netdev);
e1000_reset(adapter);
e1000_clean_all_tx_rings(adapter);
@@ -3744,10 +3761,12 @@ static irqreturn_t e1000_intr(int irq, void *data)
adapter->total_rx_bytes = 0;
adapter->total_rx_packets = 0;
__napi_schedule(&adapter->napi);
- } else
+ } else {
/* this really should not happen! if it does it is basically a
* bug, but not a hard error, so enable ints and continue */
- e1000_irq_enable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->flags))
+ e1000_irq_enable(adapter);
+ }
return IRQ_HANDLED;
}
@@ -3777,7 +3796,8 @@ static int e1000_clean(struct napi_struct *napi, int budget)
if (likely(adapter->itr_setting & 3))
e1000_set_itr(adapter);
napi_complete(napi);
- e1000_irq_enable(adapter);
+ if (!test_bit(__E1000_DOWN, &adapter->flags))
+ e1000_irq_enable(adapter);
}
return work_done;
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