[SCSI] ibmvscsi: Changeable queue depth
Adds support for a changeable queue depth to ibmvscsi.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index b10eefe..b580af95 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -1375,6 +1375,23 @@
return 0;
}
+/**
+ * ibmvscsi_change_queue_depth - Change the device's queue depth
+ * @sdev: scsi device struct
+ * @qdepth: depth to set
+ *
+ * Return value:
+ * actual depth set
+ **/
+static int ibmvscsi_change_queue_depth(struct scsi_device *sdev, int qdepth)
+{
+ if (qdepth > IBMVSCSI_MAX_CMDS_PER_LUN)
+ qdepth = IBMVSCSI_MAX_CMDS_PER_LUN;
+
+ scsi_adjust_queue_depth(sdev, 0, qdepth);
+ return sdev->queue_depth;
+}
+
/* ------------------------------------------------------------
* sysfs attributes
*/
@@ -1521,6 +1538,7 @@
.eh_abort_handler = ibmvscsi_eh_abort_handler,
.eh_device_reset_handler = ibmvscsi_eh_device_reset_handler,
.slave_configure = ibmvscsi_slave_configure,
+ .change_queue_depth = ibmvscsi_change_queue_depth,
.cmd_per_lun = 16,
.can_queue = IBMVSCSI_MAX_REQUESTS_DEFAULT,
.this_id = -1,