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From:   Christoph Hellwig <hch@lst.de>
To:     Sagi Grimberg <sagi@grimberg.me>, Keith Busch <kbusch@kernel.org>,
        Jens Axboe <axboe@kernel.dk>
Cc:     Chao Leng <lengchao@huawei.com>, linux-block@vger.kernel.org,
        linux-nvme@lists.infradead.org
Subject: fix nvme-tcp and nvme-rdma controller reset hangs when using multipath
Date:   Mon, 22 Mar 2021 08:37:24 +0100
Message-Id: <20210322073726.788347-1-hch@lst.de>
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Hi all,

this series attempts to fix the nvme queue freeze deadlock Sagi reported.
It needs a little help from the block layer so that we can avoid blocking
on the queue free percpu_ref without forcing the entire NOWAIT flag and
thus also not waiting for tag allocations.