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

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Message-Id: <20250902125017.41371-1-rongqianfeng@vivo.com>
Date: Tue,  2 Sep 2025 20:50:14 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: "Martin K. Petersen" <martin.petersen@...cle.com>,
	Qianfeng Rong <rongqianfeng@...o.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-scsi@...r.kernel.org,
	target-devel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: target: iscsi: Use int type to store negative value

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",
-- 
2.34.1