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path: root/drivers/usb/host/uhci-q.c
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Diffstat (limited to 'drivers/usb/host/uhci-q.c')
-rw-r--r--drivers/usb/host/uhci-q.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 1f0c2cf26e5d..5631d89c8730 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)