linux-kernel - Re: [PATCH v2 2/2] nvmet-fc: avoid scheduling association deletion twice

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Message-ID: <24d92bef-6982-4cbc-91d1-49c21090860f@suse.de>
Date: Tue, 2 Sep 2025 10:55:37 +0200
From: Hannes Reinecke <hare@...e.de>
To: Daniel Wagner <wagi@...nel.org>, James Smart <james.smart@...adcom.com>,
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
 Keith Busch <kbusch@...nel.org>
Cc: Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
 linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] nvmet-fc: avoid scheduling association deletion
 twice

On 8/29/25 17:43, Daniel Wagner wrote:
> When forcefully shutting down a port via the configfs interface,
> nvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and
> then nvmet_disable_port(). Both functions will eventually schedule all
> remaining associations for deletion.
> 
> The current implementation checks whether an association is about to be
> removed, but only after the work item has already been scheduled. As a
> result, it is possible for the first scheduled work item to free all
> resources, and then for the same work item to be scheduled again for
> deletion.
> 
> Because the association list is an RCU list, it is not possible to take
> a lock and remove the list entry directly, so it cannot be looked up
> again. Instead, a flag (terminating) must be used to determine whether
> the association is already in the process of being deleted.
> 
> Signed-off-by: Daniel Wagner <wagi@...nel.org>
> ---
>   drivers/nvme/target/fc.c | 16 +++++++++-------
>   1 file changed, 9 insertions(+), 7 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich