diff --git a/drivers/net/wireless/intel/iwlegacy/3945-mac.c b/drivers/net/wireless/intel/iwlegacy/3945-mac.c
index 104748fcdc33..54991f31c52c 100644
--- a/drivers/net/wireless/intel/iwlegacy/3945-mac.c
+++ b/drivers/net/wireless/intel/iwlegacy/3945-mac.c
@@ -3224,7 +3224,9 @@ il3945_store_measurement(struct device *d, struct device_attribute *attr,
 
 	D_INFO("Invoking measurement of type %d on " "channel %d (for '%s')\n",
 	       type, params.channel, buf);
+	mutex_lock(&il->mutex);
 	il3945_get_measurement(il, &params, type);
+	mutex_unlock(&il->mutex);
 
 	return count;
 }