From: Erez Shitrit <ere...@mellanox.com>
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to touch members of the priv object that are no longer valid.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:[<ffffffffa021bb47>] [<ffffffffa021bb47>]
ipoib_cm_create_tx_qp+0x57/0x90 [ib_ipoib]
Process ipoib (pid: 5916, threadinfo ffff8803786e4000, task ffff8804150e1500)
Stack:
Call Trace:
[<ffffffff81309ef0>] ? get_random_bytes+0x20/0x30
[<ffffffffa021be2a>] ipoib_cm_tx_init+0xca/0x340 [ib_ipoib]
[<ffffffffa021f765>] ipoib_cm_tx_start+0x215/0x3f0 [ib_ipoib]
[<ffffffffa021f550>] ? ipoib_cm_tx_start+0x0/0x3f0 [ib_ipoib]
[<ffffffff8108b2b0>] worker_thread+0x170/0x2a0
[<ffffffff81090bf0>] ? autoremove_wake_function+0x0/0x40
[<ffffffff8108b140>] ? worker_thread+0x0/0x2a0
[<ffffffff81090886>] kthread+0x96/0xa0
[<ffffffff8100c14a>] child_rip+0xa/0x20
[<ffffffff810907f0>] ? kthread+0x0/0xa0
[<ffffffff8100c140>] ? child_rip+0x0/0x20
Fix that by flushing all pending path queries at this point.
Signed-off-by: Alex Markuze <mark...@mellanox.com>
Signed-off-by: Erez Shitrit <ere...@mellanox.com>
Signed-off-by: Or Gerlitz <ogerl...@mellanox.com>
---
drivers/infiniband/ulp/ipoib/ipoib_ib.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c
b/drivers/infiniband/ulp/ipoib/ipoib_ib.c
index ff64b16..6a7003d 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+ * that may wish to touch priv fields that are no longer valid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);
--
1.7.1
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