linux-kernel - Re: [PATCH v2] nvmet-fc: associations list protected by rcu, instead of spinlock

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Date:   Mon, 11 Jan 2021 15:46:20 -0800
From:   James Smart <james.smart@...adcom.com>
To:     leonid.ravich@...l.com
Cc:     lravich@...il.com, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] nvmet-fc: associations list protected by rcu, instead
 of spinlock_irq where possible.



On 1/3/2021 10:12 AM, leonid.ravich@...l.com wrote:
> From: Leonid Ravich <Leonid.Ravich@....com>
>
> searching assoc_list protected by rcu_read_lock if list not changed inline.
> and according to the rcu list rules.
>
> queue array embedded into nvmet_fc_tgt_assoc protected by rcu_read_lock
> according to rcu dereference/assign rules.
>
> queue and assoc object freed after grace period by call_rcu.
>
> tgtport lock taken for changing assoc_list.
>
> Reviewed-by: Eldad Zinger <Eldad.Zinger@...l.com>
> Reviewed-by: Elad Grupi <Elad.Grupi@...l.com>
> Signed-off-by: Leonid Ravich <Leonid.Ravich@....com>
> ---
> 1) fixed sytle issus
> 2) queues array protects by rcu as well
>
>   drivers/nvme/target/fc.c | 81 +++++++++++++++++++++++-------------------------
>   1 file changed, 38 insertions(+), 43 deletions(-)
>
>

Reviewed-by: James Smart <james.smart@...adcom.com>

-- james


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