[PATCH] scsi_scan: don't dump trace when scsi_prep_async_scan() is called twice

From: Vitaly Kuznetsov
Date: Mon Aug 31 2015 - 11:01:03 EST

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

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@xxxxxxxxxx>
drivers/scsi/scsi_scan.c | 3 +--
1 file changed, 1 insertion(+), 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;


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