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staging: octeon-usb: never retry after xacterr

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Never retry after xacterr. The DMA engine cannot handle that properly
and may result in wrong transfer count and hang.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aaro Koskinen 2015-03-22 17:37:52 +02:00 committed by Greg Kroah-Hartman
parent d712648a22
commit 532edc93e2
1 changed files with 5 additions and 33 deletions
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38
drivers/staging/octeon-usb/octeon-hcd.c
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@ -2685,40 +2685,12 @@ static int cvmx_usb_poll_channel(struct cvmx_usb_state *usb, int channel)
CVMX_USB_COMPLETE_STALL);
} else if (usbc_hcint.s.xacterr) {
/*
* We know at least one packet worked if we get a ACK or NAK.
* Reset the retry counter
* XactErr as a response means the device signaled
* something wrong with the transfer. For example, PID
* toggle errors cause these.
*/
if (usbc_hcint.s.nak || usbc_hcint.s.ack)
transaction->retries = 0;
transaction->retries++;
if (transaction->retries > MAX_RETRIES) {
/*
* XactErr as a response means the device signaled
* something wrong with the transfer. For example, PID
* toggle errors cause these
*/
cvmx_usb_perform_complete(usb, pipe, transaction,
CVMX_USB_COMPLETE_XACTERR);
} else {
/*
* If this was a split then clear our split in progress
* marker
*/
if (usb->active_split == transaction)
usb->active_split = NULL;
/*
* Rewind to the beginning of the transaction by anding
* off the split complete bit
*/
transaction->stage &= ~1;
pipe->split_sc_frame = -1;
pipe->next_tx_frame += pipe->interval;
if (pipe->next_tx_frame < usb->frame_number)
pipe->next_tx_frame =
usb->frame_number + pipe->interval -
(usb->frame_number -
pipe->next_tx_frame) % pipe->interval;
}
cvmx_usb_perform_complete(usb, pipe, transaction,
CVMX_USB_COMPLETE_XACTERR);
} else if (usbc_hcint.s.bblerr) {
/* Babble Error (BblErr) */
cvmx_usb_perform_complete(usb, pipe, transaction,