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| author | Yossi Etigin <yosefe@voltaire.com> | 2009-04-20 13:58:08 -0700 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2009-04-20 13:58:08 -0700 |
| commit | e028cc55cc5c90a1c57eefe560a0cbb4df1fed14 (patch) | |
| tree | b1ef203c107a4589536a089737ae550e0b18451b /drivers/infiniband | |
| parent | a939b96cccdb65df80a52447ec8e4a6d79c56dbb (diff) | |
| download | lwn-e028cc55cc5c90a1c57eefe560a0cbb4df1fed14.tar.gz lwn-e028cc55cc5c90a1c57eefe560a0cbb4df1fed14.zip | |
IPoIB: Disable NAPI while CQ is being drained
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>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_ib.c | 6 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 5 |
2 files changed, 5 insertions, 6 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c index da6082739839..e7e5adf84e84 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -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); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 421a6640c9bd..ab2c192c76bc 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -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); |