linux-kernel - Re: [PATCH] scsi: target: iscsi: Use int type to store negative value

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Message-ID: <c487f4b9-10f1-44c4-955e-c64fcc0b25d2@oracle.com>
Date: Thu, 4 Sep 2025 10:12:12 -0500
From: michael.christie@...cle.com
To: Qianfeng Rong <rongqianfeng@...o.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Al Viro <viro@...iv.linux.org.uk>, linux-scsi@...r.kernel.org,
        target-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: target: iscsi: Use int type to store negative value

On 9/2/25 7:50 AM, Qianfeng Rong wrote:
> Change the 'ret' variable in iscsit_tmr_task_reassign() from u64 to int,
> as it needs to store either negative value or zero returned by
> iscsit_find_cmd_for_recovery().
> 
> Storing the negative error codes in unsigned type, or performing equality
> comparisons (e.g., ret == -2), doesn't cause an issue at runtime [1] but
> can be confusing.  Additionally, assigning negative error codes to unsigned
> type may trigger a GCC warning when the -Wsign-conversion flag is enabled.
> 
> No effect on runtime.
> 
> Link: https://lore.kernel.org/all/x3wogjf6vgpkisdhg3abzrx7v7zktmdnfmqeih5kosszmagqfs@oh3qxrgzkikf/ #1
> Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
> ---
>  drivers/target/iscsi/iscsi_target_tmr.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/target/iscsi/iscsi_target_tmr.c b/drivers/target/iscsi/iscsi_target_tmr.c
> index f60b156ede12..620de3910599 100644
> --- a/drivers/target/iscsi/iscsi_target_tmr.c
> +++ b/drivers/target/iscsi/iscsi_target_tmr.c
> @@ -112,7 +112,8 @@ u8 iscsit_tmr_task_reassign(
>  	struct iscsi_tmr_req *tmr_req = cmd->tmr_req;
>  	struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
>  	struct iscsi_tm *hdr = (struct iscsi_tm *) buf;
> -	u64 ret, ref_lun;
> +	u64 ref_lun;
> +	int ret;
>  
>  	pr_debug("Got TASK_REASSIGN TMR ITT: 0x%08x,"
>  		" RefTaskTag: 0x%08x, ExpDataSN: 0x%08x, CID: %hu\n",

Reviewed-by: Mike Christie <michael.christie@...cle.com>