diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2007-01-08 20:01:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-02-08 02:44:35 +0300 |
| commit | 85a975d0ce48dfa8dec5bf1bd970f8fd2c48af32 (patch) | |
| tree | b122cba23280c7ff01e3e301d08f7e7c56bae8e5 /drivers/usb/host/uhci-q.c | |
| parent | f3fe239b67424d88104e32076aec902c0642925f (diff) | |
| download | linux-85a975d0ce48dfa8dec5bf1bd970f8fd2c48af32.tar.xz | |
UHCI: no dummy TDs for Iso QHs
Isochronous queues don't need a dummy TD because the Queue Header
isn't managed by the hardware. This patch (as836) removes the
unnecessary dummy TDs.
The patch also fixes a long-standing typo in a comment (a "don't" was
missing -- potentially very confusing!).
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/uhci-q.c')
| -rw-r--r-- | drivers/usb/host/uhci-q.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c index 30b88459ac7d..5afcc5227284 100644 --- a/drivers/usb/host/uhci-q.c +++ b/drivers/usb/host/uhci-q.c @@ -248,16 +248,18 @@ static struct uhci_qh *uhci_alloc_qh(struct uhci_hcd *uhci, INIT_LIST_HEAD(&qh->node); if (udev) { /* Normal QH */ - qh->dummy_td = uhci_alloc_td(uhci); - if (!qh->dummy_td) { - dma_pool_free(uhci->qh_pool, qh, dma_handle); - return NULL; + qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; + if (qh->type != USB_ENDPOINT_XFER_ISOC) { + qh->dummy_td = uhci_alloc_td(uhci); + if (!qh->dummy_td) { + dma_pool_free(uhci->qh_pool, qh, dma_handle); + return NULL; + } } qh->state = QH_STATE_IDLE; qh->hep = hep; qh->udev = udev; hep->hcpriv = qh; - qh->type = hep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK; } else { /* Skeleton QH */ qh->state = QH_STATE_ACTIVE; @@ -275,7 +277,8 @@ static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh) list_del(&qh->node); if (qh->udev) { qh->hep->hcpriv = NULL; - uhci_free_td(uhci, qh->dummy_td); + if (qh->dummy_td) + uhci_free_td(uhci, qh->dummy_td); } dma_pool_free(uhci->qh_pool, qh, qh->dma_handle); } @@ -327,7 +330,7 @@ static int uhci_cleanup_queue(struct uhci_hcd *uhci, struct uhci_qh *qh, goto done; qh->element = UHCI_PTR_TERM; - /* Control pipes have to worry about toggles */ + /* Control pipes don't have to worry about toggles */ if (qh->type == USB_ENDPOINT_XFER_CONTROL) goto done; |