PATCH [8/11] qla2xxx: SYSFS queue-depth override

diff -Nru a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
@@ -162,6 +162,20 @@
 
 static int qla2x00_proc_info(struct Scsi_Host *, char *, char **,
     off_t, int, int);
+static ssize_t qla2xxx_store_queue_depth(struct device *, const char *, size_t);
+
+static struct device_attribute qla2xxx_queue_depth_attr = {
+	.attr = {
+		.name =		"queue_depth",
+		.mode =		S_IWUSR,
+	},
+	.store = qla2xxx_store_queue_depth,
+};
+
+static struct device_attribute *qla2xxx_dev_attrs[] = {
+	&qla2xxx_queue_depth_attr,
+	NULL,
+};
 
 static struct scsi_host_template qla2x00_driver_template = {
 	.module			= THIS_MODULE,

@@ -187,6 +201,8 @@
 	 * which equates to 0x800000 sectors.
 	 */
 	.max_sectors		= 0xFFFF,
+
+	.sdev_attrs		= qla2xxx_dev_attrs,
 };
 
 static struct scsi_transport_template *qla2xxx_transport_template = NULL;

@@ -1787,6 +1803,21 @@
 	}
 
 	return (0);
+}
+
+static ssize_t
+qla2xxx_store_queue_depth(struct device *dev, const char *buf, size_t count)
+{
+	int			 depth;
+	struct scsi_device	*sdev = to_scsi_device(dev);
+
+	if (sdev->tagged_supported) {
+		depth = simple_strtoul(buf, NULL, 0);
+		if (depth > UINT_MAX)
+			depth = UINT_MAX;
+		scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);
+	}
+	return count;
 }
 
 /**