> -----Original Message----- > From: Or Gerlitz [mailto:[email protected]] > Sent: Tuesday, July 08, 2014 5:45 AM > To: [email protected] > Cc: [email protected]; [email protected]; Estrin, Alex; Or Gerlitz > Subject: [PATCH for-3.17 3/3] IB/ipoib: Avoid flushing the workqueue from > worker > context > > From: Erez Shitrit <[email protected]> > > The error flow of ipoib_ib_dev_open() invokes ipoib_ib_dev_stop() with > work-queue flushing enabled which would turn into deadlock if the open > procedure itself was called by a worker thread. > > Fix that 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 <[email protected]> > Signed-off-by: Or Gerlitz <[email protected]> Acked-by: Alex Estrin <[email protected]> > --- > drivers/infiniband/ulp/ipoib/ipoib.h | 2 +- > drivers/infiniband/ulp/ipoib/ipoib_ib.c | 8 ++++---- > 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 683d23a..3edce61 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 be8f971..9dcb2c9 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 35acbd4..1bf994a 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)) > -- > 1.7.1
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