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Revised: 2002-Feb-09.
This is the documentation of (hopefully) all possible error codes (and
their interpretation) that can be returned from usbcore.
Some of them are returned by the Host Controller Drivers (HCDs), which
device drivers only see through usbcore. As a rule, all the HCDs should
behave the same except for transfer speed dependent behaviors.
**************************************************************************
* Error codes returned by usb_submit_urb *
**************************************************************************
Non-USB-specific:
0 URB submission went fine
-ENOMEM no memory for allocation of internal structures
USB-specific:
-ENODEV specified USB-device or bus doesn't exist
-ENXIO host controller driver does not support queuing of this type
of urb. (treat as a host controller bug.)
-EINVAL a) Invalid transfer type specified (or not supported)
b) Invalid interrupt interval (0<=n<256)
c) more than one interrupt packet requested
d) ISO: number_of_packets is < 0
-EAGAIN a) specified ISO start frame too early
b) (using ISO-ASAP) too much scheduled for the future
wait some time and try again.
-EFBIG too much ISO frames requested (currently uhci>900)
-EPIPE Specified endpoint is stalled. For non-control endpoints,
reset this status with usb_clear_halt().
-EMSGSIZE endpoint message size is zero, do interface/alternate setting
-ENOSPC The host controller's bandwidth is already consumed and
this request would push it past its allowed limit.
-ESHUTDOWN The host controller has been disabled due to some
problem that could not be worked around.
**************************************************************************
* Error codes returned by in urb->status *
* or in iso_frame_desc[n].status (for ISO) *
**************************************************************************
USB device drivers may only test urb status values in completion handlers.
This is because otherwise there would be a race between HCDs updating
these values on one CPU, and device drivers testing them on another CPU.
A transfer's actual_length may be positive even when an error has been
reported. That's because transfers often involve several packets, so that
one or more packets could finish before an error stops further endpoint I/O.
0 Transfer completed successfully
-ENOENT URB was synchronously unlinked by usb_unlink_urb
-EINPROGRESS URB still pending, no results yet
(That is, if drivers see this it's a bug.)
-EPROTO (*) a) bitstuff error
b) unknown USB error
-EILSEQ (*) CRC mismatch
-EPIPE Endpoint stalled. For non-control endpoints,
reset this status with usb_clear_halt().
-ECOMM During an IN transfer, the host controller
received data from an endpoint faster than it
could be written to system memory
-ENOSR During an OUT transfer, the host controller
could not retrieve data from system memory fast
enough to keep up with the USB data rate
-EOVERFLOW (*) The amount of data returned by the endpoint was
greater than either the max packet size of the
endpoint or the remaining buffer size. "Babble".
-EREMOTEIO The data read from the endpoint did not fill the
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.
-EXDEV ISO transfer only partially completed
look at individual frame status for details
-EINVAL ISO madness, if this happens: Log off and go home
-ECONNRESET URB was asynchronously unlinked by usb_unlink_urb
-ESHUTDOWN The host controller has been disabled due to some
problem that could not be worked around.
(*) Error codes like -EPROTO, -EILSEQ and -EOVERFLOW normally indicate
hardware problems such as bad devices (including firmware) or cables.
**************************************************************************
* Error codes returned by usbcore-functions *
* (expect also other submit and transfer status codes) *
**************************************************************************
usb_register():
-EINVAL error during registering new driver
usb_get_*/usb_set_*():
usb_control_msg():
usb_bulk_msg():
All USB errors (submit/status) can occur
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