linux-kernel - [PATCH 1/3] scsi_scan: don't dump trace when scsi_prep_async

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Date:	Thu, 17 Sep 2015 15:29:17 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, ohering@...e.com,
	jbottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org, apw@...onical.com, vkuznets@...hat.com,
	jasowang@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 1/3] scsi_scan: don't dump trace when scsi_prep_async_scan() is called twice

From: Vitaly Kuznetsov <vkuznets@...hat.com>

The only user of scsi_prep_async_scan() is scsi_scan_host() and it handles
the situation correctly. Move 'called twice' reporting to debug level as
well.

The issue is observed on Hyper-V: on any device add/remove event storvsc
driver calls scsi_scan_host() and in case previous scan is still running
we get the message and stack dump on console.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Reviewed-by: K. Y. Srinivasan <kys@...rosoft.com>
Tested-by: Alex Ng <alexng@...rosoft.com>
Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/scsi/scsi_scan.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f9f3f82..01ad016 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1712,8 +1712,7 @@ static struct async_scan_data *scsi_prep_async_scan(struct Scsi_Host *shost)
 		return NULL;
 
 	if (shost->async_scan) {
-		shost_printk(KERN_INFO, shost, "%s called twice\n", __func__);
-		dump_stack();
+		shost_printk(KERN_DEBUG, shost, "%s called twice\n", __func__);
 		return NULL;
 	}
 
-- 
1.7.4.1

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