Make usb-stop() safe to call multiple times in a row.

[platform/kernel/u-boot.git] / common / usb.c

diff --git a/common/usb.c b/common/usb.c
index 9502f39..52e5964 100644 (file)
--- a/common/usb.c
+++ b/common/usb.c
@@ -126,10 +126,15 @@ int usb_init(void)
  */
 int usb_stop(void)
 {
-       asynch_allowed=1;
-       usb_started = 0;
-       usb_hub_reset();
-       return usb_lowlevel_stop();
+       int res = 0;
+
+       if (usb_started) {
+               asynch_allowed = 1;
+               usb_started = 0;
+               usb_hub_reset();
+               res = usb_lowlevel_stop();
+       }
+       return res;
 }
 
 /*