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@xxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-ring.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index d264f9a..aac379e 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -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? */
--
1.6.0.4
--
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