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Date:   Mon, 2 Aug 2021 10:06:57 +0300
From:   Leon Romanovsky <leon@kernel.org>
To:     Jack Wang <jinpu.wang@ionos.com>
Cc:     linux-rdma@vger.kernel.org, bvanassche@acm.org,
        dledford@redhat.com, jgg@ziepe.ca, haris.iqbal@ionos.com,
        Gioh Kim <gi-oh.kim@ionos.com>
Subject: Re: [PATCH for-next 05/10] RDMA/rtrs: Fix warning when use poll mode
Message-ID: <YQeZkTIOHdqK6noK@unreal>
References: <20210730131832.118865-1-jinpu.wang@ionos.com>
 <20210730131832.118865-6-jinpu.wang@ionos.com>
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On Fri, Jul 30, 2021 at 03:18:27PM +0200, Jack Wang wrote:
> when test with poll mode, it will fail and lead to warning below:
> echo "sessname=bla path=gid:fe80::2:c903:4e:d0b3@gid:fe80::2:c903:8:ca17
> device_path=/dev/nullb2 nr_poll_queues=-1" |
> sudo tee /sys/devices/virtual/rnbd-client/ctl/map_device
> 
> rnbd_client L597: Mapping device /dev/nullb2 on session bla,
> (access_mode: rw, nr_poll_queues: 8)
> WARNING: CPU: 3 PID: 9886 at drivers/infiniband/core/cq.c:447 ib_cq_pool_get+0x26f/0x2a0 [ib_core]
> 
> The problem is in case of poll queue, we need to still call
> ib_alloc_cq/ib_free_cq, we can't use cq_poll api for poll queue.

It will be great to see an explanation here.

Thanks