diff options
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/uhci-q.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c index 1f0c2cf26e5..5631d89c873 100644 --- a/drivers/usb/host/uhci-q.c +++ b/drivers/usb/host/uhci-q.c @@ -1065,13 +1065,18 @@ static int uhci_submit_interrupt(struct uhci_hcd *uhci, struct urb *urb, } if (exponent < 0) return -EINVAL; - qh->period = 1 << exponent; - qh->skel = SKEL_INDEX(exponent); - /* For now, interrupt phase is fixed by the layout - * of the QH lists. */ - qh->phase = (qh->period / 2) & (MAX_PHASE - 1); - ret = uhci_check_bandwidth(uhci, qh); + /* If the slot is full, try a lower period */ + do { + qh->period = 1 << exponent; + qh->skel = SKEL_INDEX(exponent); + + /* For now, interrupt phase is fixed by the layout + * of the QH lists. + */ + qh->phase = (qh->period / 2) & (MAX_PHASE - 1); + ret = uhci_check_bandwidth(uhci, qh); + } while (ret != 0 && --exponent >= 0); if (ret) return ret; } else if (qh->period > urb->interval) |