tree 856376e07969f38cda1795b6c7ca46043d50630b
parent 3017013dcc82a4862bd1e140f8b762cfc594008d
author Chao Leng <lengchao@huawei.com> 1603332915 +0800
committer Christoph Hellwig <hch@lst.de> 1604395562 +0100

nvme-tcp: avoid race between time out and tear down

Now use teardown_lock to serialize for time out and tear down. This may
cause abnormal: first cancel all request in tear down, then time out may
complete the request again, but the request may already be freed or
restarted.

To avoid race between time out and tear down, in tear down process,
first we quiesce the queue, and then delete the timer and cancel
the time out work for the queue. At the same time we need to delete
teardown_lock.

Signed-off-by: Chao Leng <lengchao@huawei.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>