[PATCH 14/14] nvme: use blk_mq_[un]quiesce_tagset

[Chao Leng]

On 2022/11/22 4:44, Shakeel Butt wrote:
> On Tue, Nov 01, 2022 at 04:00:50PM +0100, Christoph Hellwig wrote:
>> From: Chao Leng <lengchao at huawei.com>
>>
>> All controller namespaces share the same tagset, so we can use this
>> interface which does the optimal operation for parallel quiesce based on
>> the tagset type(e.g. blocking tagsets and non-blocking tagsets).
>>
>> nvme connect_q should not be quiesced when quiesce tagset, so set the
>> QUEUE_FLAG_SKIP_TAGSET_QUIESCE to skip it when init connect_q.
>>
>> Currently we use NVME_NS_STOPPED to ensure pairing quiescing and
>> unquiescing. If use blk_mq_[un]quiesce_tagset, NVME_NS_STOPPED will be
>> invalided, so introduce NVME_CTRL_STOPPED to replace NVME_NS_STOPPED.
>> In addition, we never really quiesce a single namespace. It is a better
>> choice to move the flag from ns to ctrl.
>>
>> Signed-off-by: Chao Leng <lengchao at huawei.com>
>> [hch: rebased on top of prep patches]
>> Signed-off-by: Christoph Hellwig <hch at lst.de>
>> Reviewed-by: Keith Busch <kbusch at kernel.org>
>> Reviewed-by: Chao Leng <lengchao at huawei.com>
>> Reviewed-by: Hannes Reinecke <hare at suse.de>
>> Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
> 
> This patch is causing the following crash at the boot and reverting it
> fixes the issue. This is next-20221121 kernel.
This patch can fix it.
https://lore.kernel.org/linux-nvme/20221116072711.1903536-1-hch@lst.de/