mirror of https://gitee.com/openkylin/linux.git
[PATCH] UHCI: Common result routine for Control/Bulk/Interrupt
This patch (as679) combines the result routine for Control URBs with the routine for Bulk/Interrupt URBs. Along the way I eliminated the debugging printouts for Control transfers unless the debugging level is set higher than 1. I also eliminated a long-unused (#ifdef'ed-out) section that works around some buggy old APC BackUPS devices. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
Greg Kroah-Hartman
parent
0f28b55db5
commit
b1869000a6
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@ -618,134 +618,6 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb,
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return -ENOMEM;
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}
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/*
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* If control-IN transfer was short, the status packet wasn't sent.
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* This routine changes the element pointer in the QH to point at the
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* status TD. It's safe to do this even while the QH is live, because
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* the hardware only updates the element pointer following a successful
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* transfer. The inactive TD for the short packet won't cause an update,
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* so the pointer won't get overwritten. The next time the controller
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* sees this QH, it will send the status packet.
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*/
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static int usb_control_retrigger_status(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv;
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struct uhci_td *td;
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urbp->short_transfer = 1;
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td = list_entry(urbp->td_list.prev, struct uhci_td, list);
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urbp->qh->element = cpu_to_le32(td->dma_handle);
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return -EINPROGRESS;
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}
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static int uhci_result_control(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct list_head *tmp, *head;
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struct urb_priv *urbp = urb->hcpriv;
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struct uhci_td *td;
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unsigned int status;
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int ret = 0;
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head = &urbp->td_list;
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if (urbp->short_transfer) {
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tmp = head->prev;
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goto status_stage;
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}
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urb->actual_length = 0;
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tmp = head->next;
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td = list_entry(tmp, struct uhci_td, list);
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/* The first TD is the SETUP stage, check the status, but skip */
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/* the count */
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status = uhci_status_bits(td_status(td));
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if (status & TD_CTRL_ACTIVE)
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return -EINPROGRESS;
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if (status)
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goto td_error;
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/* The rest of the TDs (but the last) are data */
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tmp = tmp->next;
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while (tmp != head && tmp->next != head) {
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unsigned int ctrlstat;
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td = list_entry(tmp, struct uhci_td, list);
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tmp = tmp->next;
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ctrlstat = td_status(td);
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status = uhci_status_bits(ctrlstat);
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if (status & TD_CTRL_ACTIVE)
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return -EINPROGRESS;
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urb->actual_length += uhci_actual_length(ctrlstat);
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if (status)
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goto td_error;
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/* Check to see if we received a short packet */
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if (uhci_actual_length(ctrlstat) <
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uhci_expected_length(td_token(td))) {
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if (urb->transfer_flags & URB_SHORT_NOT_OK) {
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ret = -EREMOTEIO;
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goto err;
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}
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return usb_control_retrigger_status(uhci, urb);
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}
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}
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status_stage:
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td = list_entry(tmp, struct uhci_td, list);
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/* Control status stage */
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status = td_status(td);
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#ifdef I_HAVE_BUGGY_APC_BACKUPS
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/* APC BackUPS Pro kludge */
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/* It tries to send all of the descriptor instead of the amount */
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/* we requested */
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if (status & TD_CTRL_IOC && /* IOC is masked out by uhci_status_bits */
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status & TD_CTRL_ACTIVE &&
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status & TD_CTRL_NAK)
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return 0;
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#endif
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status = uhci_status_bits(status);
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if (status & TD_CTRL_ACTIVE)
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return -EINPROGRESS;
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if (status)
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goto td_error;
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return 0;
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td_error:
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ret = uhci_map_status(status, uhci_packetout(td_token(td)));
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err:
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if ((debug == 1 && ret != -EPIPE) || debug > 1) {
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/* Some debugging code */
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dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
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__FUNCTION__, status);
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if (errbuf) {
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/* Print the chain for debugging purposes */
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uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
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lprintk(errbuf);
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}
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}
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/* Note that the queue has stopped */
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urbp->qh->element = UHCI_PTR_TERM;
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urbp->qh->is_stopped = 1;
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return ret;
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}
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/*
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* Common submit for bulk and interrupt
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*/
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@ -864,86 +736,6 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb,
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return -ENOMEM;
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}
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/*
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* Common result for bulk and interrupt
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*/
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static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct urb_priv *urbp = urb->hcpriv;
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struct uhci_td *td;
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unsigned int status = 0;
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int ret = 0;
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urb->actual_length = 0;
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list_for_each_entry(td, &urbp->td_list, list) {
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unsigned int ctrlstat = td_status(td);
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status = uhci_status_bits(ctrlstat);
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if (status & TD_CTRL_ACTIVE)
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return -EINPROGRESS;
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urb->actual_length += uhci_actual_length(ctrlstat);
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if (status)
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goto td_error;
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if (uhci_actual_length(ctrlstat) <
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uhci_expected_length(td_token(td))) {
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if (urb->transfer_flags & URB_SHORT_NOT_OK) {
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ret = -EREMOTEIO;
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goto err;
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}
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/*
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* This URB stopped short of its end. We have to
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* fix up the toggles of the following URBs on the
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* queue and restart the queue.
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*
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* Do this only the first time we encounter the
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* short URB.
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*/
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if (!urbp->short_transfer) {
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urbp->short_transfer = 1;
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urbp->qh->initial_toggle =
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uhci_toggle(td_token(td)) ^ 1;
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uhci_fixup_toggles(urbp->qh, 1);
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td = list_entry(urbp->td_list.prev,
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struct uhci_td, list);
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urbp->qh->element = td->link;
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}
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break;
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}
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}
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return 0;
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td_error:
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ret = uhci_map_status(status, uhci_packetout(td_token(td)));
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if ((debug == 1 && ret != -EPIPE) || debug > 1) {
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/* Some debugging code */
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dev_dbg(uhci_dev(uhci), "%s: failed with status %x\n",
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__FUNCTION__, status);
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if (debug > 1 && errbuf) {
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/* Print the chain for debugging purposes */
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uhci_show_qh(urbp->qh, errbuf, ERRBUF_LEN, 0);
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lprintk(errbuf);
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}
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}
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err:
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/* Note that the queue has stopped and save the next toggle value */
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urbp->qh->element = UHCI_PTR_TERM;
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urbp->qh->is_stopped = 1;
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urbp->qh->needs_fixup = 1;
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urbp->qh->initial_toggle = uhci_toggle(td_token(td)) ^
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(ret == -EREMOTEIO);
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return ret;
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}
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static inline int uhci_submit_bulk(struct uhci_hcd *uhci, struct urb *urb,
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struct uhci_qh *qh)
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{
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@ -971,6 +763,129 @@ static inline int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb,
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return uhci_submit_common(uhci, urb, qh);
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}
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/*
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* Fix up the data structures following a short transfer
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*/
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static int uhci_fixup_short_transfer(struct uhci_hcd *uhci,
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struct uhci_qh *qh, struct urb_priv *urbp,
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struct uhci_td *short_td)
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{
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struct uhci_td *td;
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int ret = 0;
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td = list_entry(urbp->td_list.prev, struct uhci_td, list);
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if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
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urbp->short_transfer = 1;
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/* When a control transfer is short, we have to restart
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* the queue at the status stage transaction, which is
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* the last TD. */
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qh->element = cpu_to_le32(td->dma_handle);
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ret = -EINPROGRESS;
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} else if (!urbp->short_transfer) {
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urbp->short_transfer = 1;
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/* When a bulk/interrupt transfer is short, we have to
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* fix up the toggles of the following URBs on the queue
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* before restarting the queue at the next URB. */
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qh->initial_toggle = uhci_toggle(td_token(short_td)) ^ 1;
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uhci_fixup_toggles(qh, 1);
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qh->element = td->link;
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}
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return ret;
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}
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/*
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* Common result for control, bulk, and interrupt
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*/
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static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb)
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{
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struct urb_priv *urbp = urb->hcpriv;
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struct uhci_qh *qh = urbp->qh;
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struct uhci_td *td;
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struct list_head *tmp;
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unsigned status;
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int ret = 0;
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tmp = urbp->td_list.next;
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if (qh->type == USB_ENDPOINT_XFER_CONTROL) {
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if (urbp->short_transfer)
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tmp = urbp->td_list.prev;
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else
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urb->actual_length = -8; /* SETUP packet */
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} else
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urb->actual_length = 0;
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while (tmp != &urbp->td_list) {
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unsigned int ctrlstat;
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int len;
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td = list_entry(tmp, struct uhci_td, list);
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tmp = tmp->next;
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ctrlstat = td_status(td);
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status = uhci_status_bits(ctrlstat);
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if (status & TD_CTRL_ACTIVE)
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return -EINPROGRESS;
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len = uhci_actual_length(ctrlstat);
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urb->actual_length += len;
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if (status) {
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ret = uhci_map_status(status,
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uhci_packetout(td_token(td)));
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if ((debug == 1 && ret != -EPIPE) || debug > 1) {
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/* Some debugging code */
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dev_dbg(uhci_dev(uhci),
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"%s: failed with status %x\n",
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__FUNCTION__, status);
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if (debug > 1 && errbuf) {
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/* Print the chain for debugging */
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uhci_show_qh(urbp->qh, errbuf,
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ERRBUF_LEN, 0);
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lprintk(errbuf);
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}
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}
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} else if (len < uhci_expected_length(td_token(td))) {
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/* We received a short packet */
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if (urb->transfer_flags & URB_SHORT_NOT_OK)
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ret = -EREMOTEIO;
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else if (ctrlstat & TD_CTRL_SPD)
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ret = 1;
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}
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if (ret != 0)
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goto err;
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}
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return ret;
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err:
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if (ret < 0) {
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/* In case a control transfer gets an error
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* during the setup stage */
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urb->actual_length = max(urb->actual_length, 0);
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/* Note that the queue has stopped and save
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* the next toggle value */
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qh->element = UHCI_PTR_TERM;
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qh->is_stopped = 1;
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qh->needs_fixup = (qh->type != USB_ENDPOINT_XFER_CONTROL);
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qh->initial_toggle = uhci_toggle(td_token(td)) ^
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(ret == -EREMOTEIO);
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} else /* Short packet received */
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ret = uhci_fixup_short_transfer(uhci, qh, urbp, td);
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return ret;
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}
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/*
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* Isochronous transfers
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*/
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@ -1276,17 +1191,10 @@ static void uhci_scan_qh(struct uhci_hcd *uhci, struct uhci_qh *qh,
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urbp = list_entry(qh->queue.next, struct urb_priv, node);
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urb = urbp->urb;
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switch (qh->type) {
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case USB_ENDPOINT_XFER_CONTROL:
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status = uhci_result_control(uhci, urb);
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break;
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case USB_ENDPOINT_XFER_ISOC:
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if (qh->type == USB_ENDPOINT_XFER_ISOC)
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status = uhci_result_isochronous(uhci, urb);
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break;
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default: /* USB_ENDPOINT_XFER_BULK or _INT */
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else
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status = uhci_result_common(uhci, urb);
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break;
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}
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if (status == -EINPROGRESS)
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break;
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