diff options
Diffstat (limited to 'drivers/usb/host/ehci-q.c')
| -rw-r--r-- | drivers/usb/host/ehci-q.c | 38 |
1 files changed, 23 insertions, 15 deletions
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c index 5bb872c3496d..9b13bf2fa98d 100644 --- a/drivers/usb/host/ehci-q.c +++ b/drivers/usb/host/ehci-q.c @@ -514,18 +514,18 @@ qh_urb_transaction ( qtd->urb = urb; qtd_prev->hw_next = QTD_NEXT (qtd->qtd_dma); list_add_tail (&qtd->qtd_list, head); + + /* for zero length DATA stages, STATUS is always IN */ + if (len == 0) + token |= (1 /* "in" */ << 8); } /* * data transfer stage: buffer setup */ - if (likely (len > 0)) - buf = urb->transfer_dma; - else - buf = 0; + buf = urb->transfer_dma; - /* for zero length DATA stages, STATUS is always IN */ - if (!buf || is_input) + if (is_input) token |= (1 /* "in" */ << 8); /* else it's already initted to "out" pid (0 << 8) */ @@ -572,7 +572,7 @@ qh_urb_transaction ( * control requests may need a terminating data "status" ack; * bulk ones may need a terminating short packet (zero length). */ - if (likely (buf != 0)) { + if (likely (urb->transfer_buffer_length != 0)) { int one_more = 0; if (usb_pipecontrol (urb->pipe)) { @@ -912,6 +912,7 @@ submit_async ( int epnum; unsigned long flags; struct ehci_qh *qh = NULL; + int rc = 0; qtd = list_entry (qtd_list->next, struct ehci_qtd, qtd_list); epnum = ep->desc.bEndpointAddress; @@ -926,21 +927,28 @@ submit_async ( #endif spin_lock_irqsave (&ehci->lock, flags); + if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, + &ehci_to_hcd(ehci)->flags))) { + rc = -ESHUTDOWN; + goto done; + } + qh = qh_append_tds (ehci, urb, qtd_list, epnum, &ep->hcpriv); + if (unlikely(qh == NULL)) { + rc = -ENOMEM; + goto done; + } /* Control/bulk operations through TTs don't need scheduling, * the HC and TT handle it when the TT has a buffer ready. */ - if (likely (qh != NULL)) { - if (likely (qh->qh_state == QH_STATE_IDLE)) - qh_link_async (ehci, qh_get (qh)); - } + if (likely (qh->qh_state == QH_STATE_IDLE)) + qh_link_async (ehci, qh_get (qh)); + done: spin_unlock_irqrestore (&ehci->lock, flags); - if (unlikely (qh == NULL)) { + if (unlikely (qh == NULL)) qtd_list_free (ehci, urb, qtd_list); - return -ENOMEM; - } - return 0; + return rc; } /*-------------------------------------------------------------------------*/ |