linux-kernel - Re: [PATCH v3 4/4] nvme-fc: use lock accessing port

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Message-ID: <15097ba9-c84f-427c-8a9e-9823385dfd14@suse.de>
Date: Tue, 2 Sep 2025 12:27:45 +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: Yi Zhang <yi.zhang@...hat.com>,
 Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
 linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] nvme-fc: use lock accessing port_state and rport
 state

On 9/2/25 12:22, Daniel Wagner wrote:
> nvme_fc_unregister_remote removes the remote port on a lport object at
> any point in time when there is no active association. This races with
> with the reconnect logic, because nvme_fc_create_association is not
> taking a lock to check the port_state and atomically increase the
> active count on the rport.
> 
> Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@....com>
> Closes: https://lore.kernel.org/all/u4ttvhnn7lark5w3sgrbuy2rxupcvosp4qmvj46nwzgeo5ausc@uyrkdls2muwx
> Signed-off-by: Daniel Wagner <wagi@...nel.org>
> ---
>   drivers/nvme/host/fc.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 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