linux-kernel - Re: [PATCH v2 2/2] scsi: Add comment of target_destroy in scsi_host

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Date:   Tue, 17 Oct 2023 14:04:13 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Wenchao Hao <haowenchao2@...wei.com>,
        "James E . J . Bottomley" <jejb@...ux.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, louhongxiang@...wei.com
Subject: Re: [PATCH v2 2/2] scsi: Add comment of target_destroy in
 scsi_host_template

On 10/15/23 19:08, Wenchao Hao wrote:
> Add comment to tell callback function target_destroy of
> scsi_host_template is called in atomic context.
> 
> Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
> ---
>   include/scsi/scsi_host.h | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
> index 49f768d0ff37..2e8d77441064 100644
> --- a/include/scsi/scsi_host.h
> +++ b/include/scsi/scsi_host.h
> @@ -245,6 +245,9 @@ struct scsi_host_template {
>   	 * midlayer calls this point so that the driver may deallocate
>   	 * and terminate any references to the target.
>   	 *
> +	 * Note: this callback in called with spin_lock shost->host_lock held,
> +	 * so donot call functions might cause schedule
> +	 *
>   	 * Status: OPTIONAL
>   	 */
>   	void (* target_destroy)(struct scsi_target *);

The above comment can be made shorter and spelling and grammar can be 
improved. How about the following: "This callback is called with the 
host lock held and hence must not sleep."?

Thanks,

Bart.