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USB: xhci: Set -EREMOTEIO when xHC gives bad transfer length. 

The xHCI hardware reports the number of bytes untransferred for a given
transfer buffer.  If the hardware reports a bytes untransferred value
greater than the submitted buffer size, we want to play it safe and say no
data was transferred.  If the driver considers a short packet to be an
error, remember to set -EREMOTEIO.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Sarah Sharp 2009-08-28 14:28:18 -07:00 committed by Greg Kroah-Hartman
parent 204970a4bb
commit 2f697f6cbf
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/host/xhci-ring.c
View File

@ -1104,6 +1104,11 @@ static int handle_tx_event(struct xhci_hcd *xhci,
"of %d bytes left\n",
TRB_LEN(event->transfer_len));
td->urb->actual_length = 0;
if (td->urb->transfer_flags &
URB_SHORT_NOT_OK)
status = -EREMOTEIO;
else
status = 0;
}
/* Don't overwrite a previously set error code */
if (status == -EINPROGRESS) {
@ -1187,6 +1192,10 @@ td_cleanup:
urb->transfer_buffer_length,
urb->actual_length);
urb->actual_length = 0;
if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
status = -EREMOTEIO;
else
status = 0;
}
list_del(&td->td_list);
/* Was this TD slated to be cancelled but completed anyway? */