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SAMA5 UDPHS: Dont' reject read request submissions while stalled. That causes an infinite loop. When stalling, cancel all pending write requests, but cancel only a reqd request if it is in progress. It will be immediately requeued

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This commit is contained in:
Gregory Nutt 2013-09-24 15:06:17 -06:00
parent 5783fec78b
commit d979859754
1 changed files with 37 additions and 23 deletions
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60
arch/arm/src/sama5/sam_udphs.c
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@ -3588,32 +3588,36 @@ static int sam_ep_submit(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
privep->zlpsent = false;
flags = irqsave();
/* If we are stalled, then drop all requests on the floor */
if (privep->stalled)
{
sam_req_abort(privep, privreq, -EBUSY);
ulldbg("ERROR: stalled\n");
ret = -EBUSY;
}
/* Handle IN (device-to-host) requests. NOTE: If the class device is
* using the bi-directional EP0, then we assume that they intend the EP0
* IN functionality (EP0 OUT data receipt does not use requests).
* IN functionality (EP0 SETUP OUT data receipt does not use requests).
*/
else if (USB_ISEPIN(ep->eplog) || epno == EP0)
if (USB_ISEPIN(ep->eplog) || epno == EP0)
{
/* Add the new request to the request queue for the IN endpoint */
/* If the endpoint is stalled, then fail any attempts to write
* through the endpoint.
*/
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_INREQQUEUED(epno), req->len);
/* If the IN endpoint is IDLE, then transfer the data now */
if (privep->epstate == UDPHS_EPSTATE_IDLE)
if (privep->stalled)
{
ret = sam_req_write(priv, privep);
sam_req_abort(privep, privreq, -EBUSY);
ulldbg("ERROR: stalled\n");
ret = -EPERM;
}
else
{
/* Add the new request to the request queue for the IN endpoint */
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_INREQQUEUED(epno), req->len);
/* If the IN endpoint is IDLE, then transfer the data now */
if (privep->epstate == UDPHS_EPSTATE_IDLE)
{
ret = sam_req_write(priv, privep);
}
}
}
@ -3750,12 +3754,22 @@ static int sam_ep_stall(struct usbdev_ep_s *ep, bool resume)
{
usbtrace(TRACE_EPSTALL, epno);
/* Abort the current transfer if necessary */
/* If this is an IN endpoint (or endpoint 0), then cancel all
* of the pending write requests.
*/
if (privep->epstate == UDPHS_EPSTATE_SENDING ||
privep->epstate == UDPHS_EPSTATE_RECEIVING)
if (epno == 0 || USB_ISEPIN(ep->eplog))
{
sam_req_complete(privep, -EIO);
sam_req_cancel(privep, -EPERM);
}
/* Otherwise, it is an OUT endpoint. Complete any read request
* currently in progress (it will get requeued immediately).
*/
else if (privep->epstate == UDPHS_EPSTATE_RECEIVING)
{
sam_req_complete(privep, -EPERM);
}
/* Put endpoint into stalled state */