>From 1c80de2ef77e9aafe43f1207ef1d15d53ad0119b Mon Sep 17 00:00:00 2001
From: Andiry Xu <andiry.xu@xxxxxxx>
Date: Thu, 15 Jul 2010 14:20:15 +0800
Subject: [PATCH 02/10] xHCI: handle_tx_event() refactor: process_ctrl_td
This patch moves the ctrl td processing part in handle_tx_event()
into a separate function process_ctrl_td().
Signed-off-by: Andiry Xu <andiry.xu@xxxxxxx>
---
drivers/usb/host/xhci-ring.c | 184 ++++++++++++++++++++++++------------------
1 files changed, 106 insertions(+), 78 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 691a108..e28cfd1 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1356,6 +1356,109 @@ td_cleanup:
}
/*
+ * Process control tds, update urb status and actual_length.
+ */
+static int process_ctrl_td(struct xhci_hcd *xhci, struct xhci_td *td,
+ union xhci_trb *event_trb, struct xhci_transfer_event *event,
+ struct xhci_virt_ep *ep, int *status)
+{
+ struct xhci_virt_device *xdev;
+ struct xhci_ring *ep_ring;
+ unsigned int slot_id;
+ int ep_index;
+ struct xhci_ep_ctx *ep_ctx;
+ u32 trb_comp_code;
+
+ slot_id = TRB_TO_SLOT_ID(event->flags);
+ xdev = xhci->devs[slot_id];
+ ep_index = TRB_TO_EP_ID(event->flags) - 1;
+ ep_ring = xhci_dma_to_transfer_ring(ep, event->buffer);
+ ep_ctx = xhci_get_ep_ctx(xhci, xdev->out_ctx, ep_index);
+ trb_comp_code = GET_COMP_CODE(event->transfer_len);
+
+ xhci_debug_trb(xhci, xhci->event_ring->dequeue);
+ switch (trb_comp_code) {
+ case COMP_SUCCESS:
+ if (event_trb == ep_ring->dequeue) {
+ xhci_warn(xhci, "WARN: Success on ctrl setup TRB "
+ "without IOC set??\n");
+ *status = -ESHUTDOWN;
+ } else if (event_trb != td->last_trb) {
+ xhci_warn(xhci, "WARN: Success on ctrl data TRB "
+ "without IOC set??\n");
+ *status = -ESHUTDOWN;
+ } else {
+ xhci_dbg(xhci, "Successful control transfer!\n");
+ *status = 0;
+ }
+ break;
+ case COMP_SHORT_TX:
+ xhci_warn(xhci, "WARN: short transfer on control ep\n");
+ if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
+ *status = -EREMOTEIO;
+ else
+ *status = 0;
+ break;
+ default:
+ if (!xhci_requires_manual_halt_cleanup(xhci,
+ ep_ctx, trb_comp_code))
+ break;
+ xhci_dbg(xhci, "TRB error code %u, "
+ "halted endpoint index = %u\n",
+ trb_comp_code, ep_index);
+ /* else fall through */
+ case COMP_STALL:
+ /* Did we transfer part of the data (middle) phase? */
+ if (event_trb != ep_ring->dequeue &&
+ event_trb != td->last_trb)
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length
+ - TRB_LEN(event->transfer_len);
+ else
+ td->urb->actual_length = 0;
+
+ xhci_cleanup_halted_endpoint(xhci,
+ slot_id, ep_index, 0, td, event_trb);
+ return finish_td(xhci, td, event_trb, event, ep, status, true);
+ }
+ /*
+ * Did we transfer any data, despite the errors that might have
+ * happened? I.e. did we get past the setup stage?
+ */
+ if (event_trb != ep_ring->dequeue) {
+ /* The event was for the status stage */
+ if (event_trb == td->last_trb) {
+ if (td->urb->actual_length != 0) {
+ /* Don't overwrite a previously set error code
+ */
+ if ((*status == -EINPROGRESS || *status == 0) &&
+ (td->urb->transfer_flags
+ & URB_SHORT_NOT_OK))
+ /* Did we already see a short data
+ * stage? */
+ *status = -EREMOTEIO;
+ } else {
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length;
+ }
+ } else {
+ /* Maybe the event was for the data stage? */
+ if (trb_comp_code != COMP_STOP_INVAL) {
+ /* We didn't stop on a link TRB in the middle */
+ td->urb->actual_length =
+ td->urb->transfer_buffer_length -
+ TRB_LEN(event->transfer_len);
+ xhci_dbg(xhci, "Waiting for status "
+ "stage event\n");
+ return 0;
+ }
+ }
+ }
+
+ return finish_td(xhci, td, event_trb, event, ep, status, false);
+}
+
+/*
* If this function returns an error condition, it means it got a Transfer
* event with a corrupted Slot ID, Endpoint ID, or TRB DMA address.
* At this point, the host controller is probably hosed and should be reset.
@@ -1482,84 +1585,9 @@ static int handle_tx_event(struct xhci_hcd *xhci,
/* Now update the urb's actual_length and give back to the core */
/* Was this a control transfer? */
if (usb_endpoint_xfer_control(&td->urb->ep->desc)) {
- xhci_debug_trb(xhci, xhci->event_ring->dequeue);
- switch (trb_comp_code) {
- case COMP_SUCCESS:
- if (event_trb == ep_ring->dequeue) {
- xhci_warn(xhci, "WARN: Success on ctrl setup TRB without IOC set??\n");
- status = -ESHUTDOWN;
- } else if (event_trb != td->last_trb) {
- xhci_warn(xhci, "WARN: Success on ctrl data TRB without IOC set??\n");
- status = -ESHUTDOWN;
- } else {
- xhci_dbg(xhci, "Successful control transfer!\n");
- status = 0;
- }
- break;
- case COMP_SHORT_TX:
- xhci_warn(xhci, "WARN: short transfer on control ep\n");
- if (td->urb->transfer_flags & URB_SHORT_NOT_OK)
- status = -EREMOTEIO;
- else
- status = 0;
- break;
-
- default:
- if (!xhci_requires_manual_halt_cleanup(xhci,
- ep_ctx, trb_comp_code))
- break;
- xhci_dbg(xhci, "TRB error code %u, "
- "halted endpoint index = %u\n",
- trb_comp_code, ep_index);
- /* else fall through */
- case COMP_STALL:
- /* Did we transfer part of the data (middle) phase? */
- if (event_trb != ep_ring->dequeue &&
- event_trb != td->last_trb)
- td->urb->actual_length =
- td->urb->transfer_buffer_length
- - TRB_LEN(event->transfer_len);
- else
- td->urb->actual_length = 0;
-
- xhci_cleanup_halted_endpoint(xhci,
- slot_id, ep_index, 0, td, event_trb);
-
- ret = finish_td(xhci, td, event_trb, event, ep,
- &status, true);
- goto cleanup;
- }
- /*
- * Did we transfer any data, despite the errors that might have
- * happened? I.e. did we get past the setup stage?
- */
- if (event_trb != ep_ring->dequeue) {
- /* The event was for the status stage */
- if (event_trb == td->last_trb) {
- if (td->urb->actual_length != 0) {
- /* Don't overwrite a previously set error code */
- if ((status == -EINPROGRESS ||
- status == 0) &&
- (td->urb->transfer_flags
- & URB_SHORT_NOT_OK))
- /* Did we already see a short data stage? */
- status = -EREMOTEIO;
- } else {
- td->urb->actual_length =
- td->urb->transfer_buffer_length;
- }
- } else {
- /* Maybe the event was for the data stage? */
- if (trb_comp_code != COMP_STOP_INVAL) {
- /* We didn't stop on a link TRB in the middle */
- td->urb->actual_length =
- td->urb->transfer_buffer_length -
- TRB_LEN(event->transfer_len);
- xhci_dbg(xhci, "Waiting for status stage event\n");
- goto cleanup;
- }
- }
- }
+ ret = process_ctrl_td(xhci, td, event_trb, event, ep,
+ &status);
+ goto cleanup;
} else {
switch (trb_comp_code) {
case COMP_SUCCESS:
--
1.7.0.4
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