linux-kernel - Re: [PATCH v3 14/18] nvmet-fc: take tgtport reference only once

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Message-ID: <20250321061728.GF3198@lst.de>
Date: Fri, 21 Mar 2025 07:17:28 +0100
From: Christoph Hellwig <hch@....de>
To: Daniel Wagner <wagi@...nel.org>
Cc: James Smart <james.smart@...adcom.com>, Christoph Hellwig <hch@....de>,
	Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>, Hannes Reinecke <hare@...e.de>,
	Keith Busch <kbusch@...nel.org>, linux-nvme@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 14/18] nvmet-fc: take tgtport reference only once

On Tue, Mar 18, 2025 at 11:40:08AM +0100, Daniel Wagner wrote:
> The reference counting code can be simplified. Instead taking a tgtport
> refrerence at the beginning of nvmet_fc_alloc_hostport and put it back
> if not a new hostport object is allocated, only take it when a new
> hostport object is allocated.
> 
> Signed-off-by: Daniel Wagner <wagi@...nel.org>
> ---
>  drivers/nvme/target/fc.c | 24 +++++++++---------------
>  1 file changed, 9 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
> index 8b14947906948c8b4914932837b4ec90921b419d..b2f5934209f9952679dc1235fb7c927818930688 100644
> --- a/drivers/nvme/target/fc.c
> +++ b/drivers/nvme/target/fc.c
> @@ -1030,33 +1030,26 @@ nvmet_fc_alloc_hostport(struct nvmet_fc_tgtport *tgtport, void *hosthandle)
>  	struct nvmet_fc_hostport *newhost, *match = NULL;
>  	unsigned long flags;
>  
> +	/*
> +	 * A ref on tgtport is being held while executing this function,
> +	 * thus there is no need to take first one and give it back on
> +	 * exit.
> +	 */

I'd move this above the function and shorten it to:

	/*
	 * Caller hpolds a reference on tgtport.
	 */

Otherwise looks good:

Reviewed-by: Christoph Hellwig <hch@....de>