From a39c52ab887fdcefae1d7f467fb0621f30833c84 Mon Sep 17 00:00:00 2001 From: Erez Shitrit Date: Wed, 16 Oct 2013 17:37:52 +0300 Subject: [PATCH] IPoIB: Add path query flushing in ipoib_ib_dev_cleanup The path_rec_completion() callback may be invoked asynchronously even at the middle of "driver uninit" process. This can lead to scheduling a task that tries to touch members of the priv object that are no longer valid. For example the function cm_create_tx_qp can attempt to create qp with no valid priv->pd object. The following crash is one of the results: RIP: 0010:[] [] ipoib_cm_create_tx_qp+0x57/0x90 [ib_ipoib] Process ipoib (pid: 5916, threadinfo ffff8803786e4000, task ffff8804150e1500) Stack: Call Trace: [] ? get_random_bytes+0x20/0x30 [] ipoib_cm_tx_init+0xca/0x340 [ib_ipoib] [] ipoib_cm_tx_start+0x215/0x3f0 [ib_ipoib] [] ? ipoib_cm_tx_start+0x0/0x3f0 [ib_ipoib] [] worker_thread+0x170/0x2a0 [] ? autoremove_wake_function+0x0/0x40 [] ? worker_thread+0x0/0x2a0 [] kthread+0x96/0xa0 [] child_rip+0xa/0x20 [] ? kthread+0x0/0xa0 [] ? child_rip+0x0/0x20 Fix that by flushing all pending path queries at this point. Signed-off-by: Alex Markuze Signed-off-by: Erez Shitrit Signed-off-by: Or Gerlitz Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/ipoib/ipoib_ib.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c index ff64b1629dbf..6a7003ddb0be 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -1082,6 +1082,11 @@ void ipoib_ib_dev_cleanup(struct net_device *dev) struct ipoib_dev_priv *priv = netdev_priv(dev); ipoib_dbg(priv, "cleaning up ib_dev\n"); + /* + * We must make sure there are no more (path) completions + * that may wish to touch priv fields that are no longer valid + */ + ipoib_flush_paths(dev); ipoib_mcast_stop_thread(dev, 1); ipoib_mcast_dev_flush(dev); -- 2.20.1