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authorJames Bottomley <JBottomley@Odin.com>2015-04-26 21:52:46 +0300
committerJames Bottomley <JBottomley@Odin.com>2015-05-25 18:46:24 +0300
commitef10b16948bc0db51a0140be5109ad73b170a011 (patch)
treee25e3557892e8c698036bf5d2233d14c640a03fd /drivers/scsi/scsi_scan.c
parent32505876c0947a4cecc409dfbef1fc58ced6138d (diff)
downloadlinux-ef10b16948bc0db51a0140be5109ad73b170a011.tar.xz
scsi_scan: fix queue depth initialisation problem
Currently we blindly use the value of cmd_per_lun as the initial setting for queue_depth. This fails miserably (hangs the system) if it is zero, which is the default value for anything uninitialised in the template. The net result is that every host template has to set a value for cmd_per_lun. Instead, use a default value of 1 if the actual value is unset. This should pave the way for removing cmd_per_lun from all the templates and eventually from SCSI itself. Signed-off-by: James Bottomley <JBottomley@Odin.com>
Diffstat (limited to 'drivers/scsi/scsi_scan.c')
-rw-r--r--drivers/scsi/scsi_scan.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 6efab1c455e1..53a2e3391454 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -280,7 +280,8 @@ static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget,
sdev->host->cmd_per_lun, shost->bqt,
shost->hostt->tag_alloc_policy);
}
- scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun);
+ scsi_change_queue_depth(sdev, sdev->host->cmd_per_lun ?
+ sdev->host->cmd_per_lun : 1);
scsi_sysfs_device_initialize(sdev);