[PATCH] scsi: qla2xxx: don't allow negative thresholds

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

We shouldn't allow negative thresholds.  I don't know what it would do
but it can't be good.

Fixes: 8b4673ba3a1b ("scsi: qla2xxx: Add support for ZIO6 interrupt threshold")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index a31d23905753..b28f159fdaee 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -1228,7 +1228,7 @@ qla_zio_threshold_store(struct device *dev, struct device_attribute *attr,
 		return -EINVAL;
 	if (sscanf(buf, "%d", &val) != 1)
 		return -EINVAL;
-	if (val > 256)
+	if (val < 0 || val > 256)
 		return -ERANGE;
 
 	atomic_set(&vha->hw->zio_threshold, val);