linux-kernel - Re: [PATCH v3 05/16] nvmet-fcloop: Remove remote port from list when unlinking

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Message-ID: <8fdbfb01-d50e-4198-b673-2a4c51417a81@suse.de>
Date: Tue, 19 Dec 2023 08:26:36 +0100
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <dwagner@...e.de>, linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
 Sagi Grimberg <sagi@...mberg.me>, Keith Busch <kbusch@...nel.org>,
 James Smart <james.smart@...adcom.com>
Subject: Re: [PATCH v3 05/16] nvmet-fcloop: Remove remote port from list when
 unlinking

On 12/18/23 16:30, Daniel Wagner wrote:
> The remote port is removed too late from fcloop_nports list. Remove it
> when port is unregistered.
> 
> This prevents a busy loop in fcloop_exit, because it is possible the
> remote port is found in the list and thus we will never progress.
> 
> The kernel log will be spammed with
> 
>    nvme_fcloop: fcloop_exit: Failed deleting remote port
>    nvme_fcloop: fcloop_exit: Failed deleting target port
> 
> Signed-off-by: Daniel Wagner <dwagner@...e.de>
> ---
>   drivers/nvme/target/fcloop.c | 7 ++-----
>   1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c
> index c65a73433c05..ead349af30f1 100644
> --- a/drivers/nvme/target/fcloop.c
> +++ b/drivers/nvme/target/fcloop.c
> @@ -995,11 +995,6 @@ fcloop_nport_free(struct kref *ref)
>   {
>   	struct fcloop_nport *nport =
>   		container_of(ref, struct fcloop_nport, ref);
> -	unsigned long flags;
> -
> -	spin_lock_irqsave(&fcloop_lock, flags);
> -	list_del(&nport->nport_list);
> -	spin_unlock_irqrestore(&fcloop_lock, flags);
>   
>   	kfree(nport);
>   }
> @@ -1357,6 +1352,8 @@ __unlink_remote_port(struct fcloop_nport *nport)
>   		nport->tport->remoteport = NULL;
>   	nport->rport = NULL;
>   
> +	list_del(&nport->nport_list);
> +
>   	return rport;
>   }
>   
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare@...e.de                              +49 911 74053 688
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