diff options
| author | Erez Shitrit <erezsh@mellanox.com> | 2014-07-08 11:45:12 +0200 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2014-08-05 16:47:33 +0200 |
| commit | 4eae374845affc3ebf8ccfc38d554a86adc95003 (patch) | |
| tree | 7d60bd89c5f42d98b6657a177c7b7d6956c71982 /drivers/infiniband | |
| parent | IB/ipoib: Use P_Key change event instead of P_Key polling mechanism (diff) | |
| download | linux-4eae374845affc3ebf8ccfc38d554a86adc95003.tar.xz linux-4eae374845affc3ebf8ccfc38d554a86adc95003.zip | |
IB/ipoib: Avoid flushing the workqueue from worker context
The error flow of ipoib_ib_dev_open() invokes ipoib_ib_dev_stop() with
workqueue flushing enabled, which deadlocks if the open procedure
itself was called by a worker thread.
Fix this by adding a flush enabled flag to ipoib_ib_dev_open() and set
it accordingly from the locations where such a call is made.
The call trace was the following:
[<ffffffff81095bc4>] ? flush_workqueue+0x54/0x80
[<ffffffffa056c657>] ? ipoib_ib_dev_stop+0x447/0x650 [ib_ipoib]
[<ffffffffa056cc34>] ? ipoib_ib_dev_open+0x284/0x430 [ib_ipoib]
[<ffffffffa05674a8>] ? ipoib_open+0x78/0x1d0 [ib_ipoib]
[<ffffffffa05697b8>] ? ipoib_pkey_open+0x38/0x40 [ib_ipoib]
[<ffffffffa056cf3c>] ? __ipoib_ib_dev_flush+0x15c/0x2c0 [ib_ipoib]
[<ffffffffa056ce56>] ? __ipoib_ib_dev_flush+0x76/0x2c0 [ib_ipoib]
[<ffffffffa056d0a0>] ? ipoib_ib_dev_flush_heavy+0x0/0x20 [ib_ipoib]
[<ffffffffa056d0ba>] ? ipoib_ib_dev_flush_heavy+0x1a/0x20 [ib_ipoib]
[<ffffffff81094d20>] ? worker_thread+0x170/0x2a0
[<ffffffff8109b2a0>] ? autoremove_wake_function+0x0/0x40
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Acked-by: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib.h | 2 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_ib.c | 8 | ||||
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 2 |
3 files changed, 6 insertions, 6 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h index 683d23ac7cbf..3edce617c31b 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib.h +++ b/drivers/infiniband/ulp/ipoib/ipoib.h @@ -471,7 +471,7 @@ void ipoib_ib_dev_flush_heavy(struct work_struct *work); void ipoib_pkey_event(struct work_struct *work); void ipoib_ib_dev_cleanup(struct net_device *dev); -int ipoib_ib_dev_open(struct net_device *dev); +int ipoib_ib_dev_open(struct net_device *dev, int flush); int ipoib_ib_dev_up(struct net_device *dev); int ipoib_ib_dev_down(struct net_device *dev, int flush); int ipoib_ib_dev_stop(struct net_device *dev, int flush); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c index be8f971edbec..9dcb2c9e758a 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -664,7 +664,7 @@ static void ipoib_ib_tx_timer_func(unsigned long ctx) drain_tx_cq((struct net_device *)ctx); } -int ipoib_ib_dev_open(struct net_device *dev) +int ipoib_ib_dev_open(struct net_device *dev, int flush) { struct ipoib_dev_priv *priv = netdev_priv(dev); int ret; @@ -705,7 +705,7 @@ int ipoib_ib_dev_open(struct net_device *dev) dev_stop: if (!test_and_set_bit(IPOIB_FLAG_INITIALIZED, &priv->flags)) napi_enable(&priv->napi); - ipoib_ib_dev_stop(dev, 1); + ipoib_ib_dev_stop(dev, flush); return -1; } @@ -916,7 +916,7 @@ int ipoib_ib_dev_init(struct net_device *dev, struct ib_device *ca, int port) (unsigned long) dev); if (dev->flags & IFF_UP) { - if (ipoib_ib_dev_open(dev)) { + if (ipoib_ib_dev_open(dev, 1)) { ipoib_transport_dev_cleanup(dev); return -ENODEV; } @@ -1033,7 +1033,7 @@ static void __ipoib_ib_dev_flush(struct ipoib_dev_priv *priv, if (level == IPOIB_FLUSH_HEAVY) { ipoib_ib_dev_stop(dev, 0); - ipoib_ib_dev_open(dev); + ipoib_ib_dev_open(dev, 0); } /* diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index 35acbd41a5f7..1bf994a96860 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -114,7 +114,7 @@ int ipoib_open(struct net_device *dev) if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags)) return 0; - if (ipoib_ib_dev_open(dev)) + if (ipoib_ib_dev_open(dev, 1)) goto err_disable; if (ipoib_ib_dev_up(dev)) |