devsd: handle case where theres no ifc->enable() function

diff --git a/sys/src/9/port/devsd.c b/sys/src/9/port/devsd.c
index dd1feeedf46d4f355a3e6e2a1562c9f9d747b122..5ea1d47b8037d88e420028a618c6d2869ae76b87 100644 (file)
--- a/sys/src/9/port/devsd.c
+++ b/sys/src/9/port/devsd.c
@@ -306,8 +306,8 @@ sdgetunit(SDev* sdev, int subno)
                unit->subno = subno;
                unit->dev = sdev;
        
-               if(sdev->enabled == 0 && sdev->ifc->enable)
-                       sdev->enabled = sdev->ifc->enable(sdev);
+               if(sdev->enabled == 0)
+                       sdev->enabled = sdev->ifc->enable == nil || sdev->ifc->enable(sdev);
 
                /*
                 * No need to lock anything here as this is only