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authorYossi Etigin <yosefe@voltaire.com>2009-04-20 20:58:08 (GMT)
committerRoland Dreier <rolandd@cisco.com>2009-04-20 20:58:08 (GMT)
commite028cc55cc5c90a1c57eefe560a0cbb4df1fed14 (patch)
treeb1ef203c107a4589536a089737ae550e0b18451b /drivers/infiniband/ulp
parenta939b96cccdb65df80a52447ec8e4a6d79c56dbb (diff)
downloadlinux-fsl-qoriq-e028cc55cc5c90a1c57eefe560a0cbb4df1fed14.tar.xz
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')
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_ib.c6
-rw-r--r--drivers/infiniband/ulp/ipoib/ipoib_main.c5
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 da60827..e7e5adf 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 421a664..ab2c192 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);