linux-kernel - [PATCH 2/2] scsi: target: iscsi: don't warn of R/W when no data

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Date:   Thu,  7 Dec 2023 09:42:35 -0800
From:   <lduncan@...e.com>
To:     target-devel@...r.kernel.org
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        dbond@...e.com, hare@...e.de, cleech@...hat.com,
        michael.christie@...cle.com, Lee Duncan <lduncan@...e.com>
Subject: [PATCH 2/2] scsi: target: iscsi: don't warn of R/W when no data

From: Lee Duncan <lduncan@...e.com>

The LIO target code has a warning about setting the
read and/or write header bits with a PDU that has zero
transfer length, even though the code mentions that the
SPEC (RFC 3720) allows this, and that some initiators
set these bits. But in practice such initiators end up
flooding the logs with thousands of warning messages for
IO that is allowed.

So change this to a debug message, and clean up the wording
just a little bit while at it.

Signed-off-by: Lee Duncan <lduncan@...e.com>
Reviewed-by: David Bond <dbond@...e.com>
---
 drivers/target/iscsi/iscsi_target.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index f246e5015868..c82dc2cd08b3 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1039,9 +1039,10 @@ int iscsit_setup_scsi_cmd(struct iscsit_conn *conn, struct iscsit_cmd *cmd,
 		hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 		hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 
-		pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
+		pr_debug("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 			" set when Expected Data Transfer Length is 0 for"
-			" CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
+			" CDB: 0x%02x, cleared READ/WRITE flag(s)\n",
+			hdr->cdb[0]);
 	}
 
 	if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
-- 
2.43.0