Re: [PATCH 1/4] scsi: core: constify pointer to scsi_host_template

From: John Garry <john.garry@huawei.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Alim Akhtar <alim.akhtar@samsung.com>,
	"Avri Altman" <avri.altman@wdc.com>,
	Doug Gilbert <dgilbert@interlog.com>,
	<linux-scsi@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/4] scsi: core: constify pointer to scsi_host_template
Date: Fri, 8 Apr 2022 13:14:08 +0100	[thread overview]
Message-ID: <2a88a992-641a-b3ff-fe39-7a61fff87cb6@huawei.com> (raw)
In-Reply-To: <20220408103027.311624-1-krzysztof.kozlowski@linaro.org>

On 08/04/2022 11:30, Krzysztof Kozlowski wrote:
> Several pointers to 'struct scsi_host_template' do not modify it, so
> made them const for safety.
> 

Is this standard practice? What is so special here?

Thanks,
john

> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> ---
>   drivers/scsi/hosts.c      |  2 +-
>   drivers/scsi/scsi_error.c | 17 +++++++++--------
>   drivers/scsi/scsi_proc.c  |  2 +-
>   drivers/scsi/scsi_sysfs.c |  6 +++---
>   4 files changed, 14 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
> index f69b77cbf538..65616a01761a 100644
> --- a/drivers/scsi/hosts.c
> +++ b/drivers/scsi/hosts.c
> @@ -209,7 +209,7 @@ EXPORT_SYMBOL(scsi_remove_host);
>   int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
>   			   struct device *dma_dev)
>   {
> -	struct scsi_host_template *sht = shost->hostt;
> +	const struct scsi_host_template *sht = shost->hostt;
>   	int error = -EINVAL;
>   
>   	shost_printk(KERN_INFO, shost, "%s\n",
> diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c