- patches.fixes/patch-2.6.11-rc1: 2.6.11-rc1.

[linux-flexiantxendom0-3.2.10.git] / Documentation / usb / error-codes.txt

diff --git a/Documentation/usb/error-codes.txt b/Documentation/usb/error-codes.txt
index 09754b7..9e41284 100644 (file)
--- a/Documentation/usb/error-codes.txt
+++ b/Documentation/usb/error-codes.txt
@@ -83,7 +83,18 @@ one or more packets could finish before an error stops further endpoint I/O.
                           prescribed bus turn-around time
                        c) unknown USB error 
 
--EILSEQ (*, **)                CRC mismatch
+-EILSEQ (*, **)                a) CRC mismatch
+                       b) no response packet received within the
+                          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.
 
 -EPIPE (**)            Endpoint stalled.  For non-control endpoints,
                        reset this status with usb_clear_halt().
@@ -104,8 +115,6 @@ one or more packets could finish before an error stops further endpoint I/O.
                        specified buffer, and URB_SHORT_NOT_OK was set in
                        urb->transfer_flags.
 
--ETIMEDOUT (**)                transfer timed out, NAK
-
 -ENODEV                        Device was removed.  Often preceded by a burst of
                        other errors, since the hub driver does't detect
                        device removal events immediately.
@@ -143,4 +152,4 @@ usb_register():
 usb_get_*/usb_set_*():
 usb_control_msg():
 usb_bulk_msg():
-                       All USB errors (submit/status) can occur
+-ETIMEDOUT             timeout expired before the transfer completed