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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/ulp/ipoib/ipoib_ib.c | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6 (diff) | |
| download | linux-dev-e028cc55cc5c90a1c57eefe560a0cbb4df1fed14.tar.xz linux-dev-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/ulp/ipoib/ipoib_ib.c')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_ib.c | 6 |
1 files changed, 4 insertions, 2 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); |