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IPoIB: Disable NAPI while CQ is being drained

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If NAPI is enabled while IPoIB's CQ is being drained, it creates a
race on priv->ibwc between ipoib_poll() and ipoib_drain_cq(), leading
to memory corruption.

The solution is to enable/disable NAPI in ipoib_ib_dev_{open/stop}()
instead of in ipoib_{open/stop}(), and sync NAPI on the INITIALIZED
flag instead on the ADMIN_UP flag. This way NAPI will be disabled when
ipoib_drain_cq() is called.

This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=1587>.

Signed-off-by: Yossi Etigin <yosefe@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Yossi Etigin 2009-04-20 13:58:08 -07:00 committed by Roland Dreier
parent a939b96ccc
commit e028cc55cc
2 changed files with 5 additions and 6 deletions
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6
drivers/infiniband/ulp/ipoib/ipoib_ib.c
View file

@ -685,7 +685,8 @@ int ipoib_ib_dev_open(struct net_device *dev)
queue_delayed_work(ipoib_workqueue, &priv->ah_reap_task,
round_jiffies_relative(HZ));
set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
napi_enable(&priv->napi);
return 0;
}
@ -804,7 +805,8 @@ int ipoib_ib_dev_stop(struct net_device *dev, int flush)
struct ipoib_tx_buf *tx_req;
int i;
clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags);
if (test_and_clear_bit(IPOIB_FLAG_INITIALIZED, &priv->flags))
napi_disable(&priv->napi);
ipoib_cm_dev_stop(dev);

5
drivers/infiniband/ulp/ipoib/ipoib_main.c
View file

@ -106,8 +106,7 @@ int ipoib_open(struct net_device *dev)
ipoib_dbg(priv, "bringing up interface\n");
if (!test_and_set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
napi_enable(&priv->napi);
set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
if (ipoib_pkey_dev_delay_open(dev))
return 0;
@ -143,7 +142,6 @@ err_stop:
ipoib_ib_dev_stop(dev, 1);
err_disable:
napi_disable(&priv->napi);
clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
return -EINVAL;
@ -156,7 +154,6 @@ static int ipoib_stop(struct net_device *dev)
ipoib_dbg(priv, "stopping interface\n");
clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
napi_disable(&priv->napi);
netif_stop_queue(dev);