linux-kernel - [PATCH] scsi_scan: move 'INQUIRY result too short' message to debug level

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Message-Id: <1441025401-30044-1-git-send-email-vkuznets@redhat.com>
Date:	Mon, 31 Aug 2015 14:50:01 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	"James E.J. Bottomley" <JBottomley@...n.com>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Long Li <longli@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH] scsi_scan: move 'INQUIRY result too short' message to debug level

Some Hyper-V hosts are known for ignoring SPC-2/3/4 requirement
for 'INQUIRY data (see table ...) shall contain at least 36 bytes'. As a
result we get tons on 'scsi 0:7:1:1: scsi scan: INQUIRY result too short
(5), using 36' messages on console. As Hyper-V is also known for its
serial port being extremely slow multi-VCPU guests we get CPU blocked
putting these (useless) messages on console (e.g. happens when we add
multiple disks). Move them to debug level.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/scsi/scsi_scan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f9f3f82..cb5c50a 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -701,7 +701,7 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
 	 * strings.
 	 */
 	if (sdev->inquiry_len < 36) {
-		sdev_printk(KERN_INFO, sdev,
+		sdev_printk(KERN_DEBUG, sdev,
 			    "scsi scan: INQUIRY result too short (%d),"
 			    " using 36\n", sdev->inquiry_len);
 		sdev->inquiry_len = 36;
-- 
2.4.3

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