vserver 2.0 rc7

[linux-2.6.git] / Documentation / usb / error-codes.txt

diff --git a/Documentation/usb/error-codes.txt b/Documentation/usb/error-codes.txt
index 9e41284..1e36f16 100644 (file)
--- a/Documentation/usb/error-codes.txt
+++ b/Documentation/usb/error-codes.txt
@@ -23,6 +23,9 @@ USB-specific:
 
 -ENODEV                specified USB-device or bus doesn't exist
 
+-ENOENT                specified interface or endpoint does not exist or
+               is not enabled
+
 -ENXIO         host controller driver does not support queuing of this type
                of urb.  (treat as a host controller bug.)
 
@@ -88,13 +91,19 @@ one or more packets could finish before an error stops further endpoint I/O.
                           prescribed bus turn-around time
                        c) unknown USB error 
 
-                       In cases b) and c) either -EPROTO or -EILSEQ
-                       may be returned.  Note that often the controller
-                       hardware does not distinguish among cases a),
-                       b), and c), so a driver cannot tell whether
-                       there was a protocol error, a failure to respond
-                       (often caused by device disconnect), or some
-                       other fault.
+                       Note that often the controller hardware does not
+                       distinguish among cases a), b), and c), so a
+                       driver cannot tell whether there was a protocol
+                       error, a failure to respond (often caused by
+                       device disconnect), or some other fault.
+
+-ETIMEDOUT (**)                No response packet received within the prescribed
+                       bus turn-around time.  This error may instead be
+                       reported as -EPROTO or -EILSEQ.
+
+                       Note that the synchronous USB message functions
+                       also use this code to indicate timeout expired
+                       before the transfer completed.
 
 -EPIPE (**)            Endpoint stalled.  For non-control endpoints,
                        reset this status with usb_clear_halt().
@@ -152,4 +161,7 @@ usb_register():
 usb_get_*/usb_set_*():
 usb_control_msg():
 usb_bulk_msg():
--ETIMEDOUT             timeout expired before the transfer completed
+-ETIMEDOUT             Timeout expired before the transfer completed.
+                       In the future this code may change to -ETIME,
+                       whose definition is a closer match to this sort
+                       of error.