linux-kernel - Re: [PATCH] nvmet: Initialize discovery subsys after debugfs is initialized

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Message-ID: <2d3a9693-cbaa-46b8-9c66-d4aaf04429b4@suse.de>
Date: Tue, 29 Jul 2025 09:28:34 +0200
From: Hannes Reinecke <hare@...e.de>
To: Mohamed Khalfella <mkhalfella@...estorage.com>,
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
 Chaitanya Kulkarni <kch@...dia.com>, Keith Busch <kbusch@...nel.org>
Cc: Hannes Reinecke <hare@...nel.org>, Daniel Wagner <dwagner@...e.de>,
 Randy Jennings <randyj@...estorage.com>, linux-nvme@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvmet: Initialize discovery subsys after debugfs is
 initialized

On 7/25/25 22:50, Mohamed Khalfella wrote:
> During nvme target initialization discovery subsystem is initialized
> before "nvmet" debugfs directory is created. This results in discovery
> subsystem debugfs directory to be created in debugfs root directory.
> 
> nvmet_init() ->
>    nvmet_init_discovery() ->
>      nvmet_subsys_alloc() ->
>        nvmet_debugfs_subsys_setup()
> 
> In other words, the codepath above is exeucted before nvmet_debugfs is
> created. We get /sys/kernel/debug/nqn.2014-08.org.nvmexpress.discovery
> instead of /sys/kernel/debug/nvmet/nqn.2014-08.org.nvmexpress.discovery.
> Move nvmet_init_discovery() call after nvmet_init_debugfs() to fix it.
> 
> Fixes: 649fd41420a8 ("nvmet: add debugfs support")
> Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
> ---
>   drivers/nvme/target/core.c | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...nel.org>

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