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path: root/drivers/usb/host/ehci-sched.c
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Diffstat (limited to 'drivers/usb/host/ehci-sched.c')
-rw-r--r--drivers/usb/host/ehci-sched.c21
1 files changed, 18 insertions, 3 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index a92526d6e5ae..d9f78eb26572 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -98,7 +98,14 @@ static void periodic_unlink (struct ehci_hcd *ehci, unsigned frame, void *ptr)
*/
*prev_p = *periodic_next_shadow(ehci, &here,
Q_NEXT_TYPE(ehci, *hw_p));
- *hw_p = *shadow_next_periodic(ehci, &here, Q_NEXT_TYPE(ehci, *hw_p));
+
+ if (!ehci->use_dummy_qh ||
+ *shadow_next_periodic(ehci, &here, Q_NEXT_TYPE(ehci, *hw_p))
+ != EHCI_LIST_END(ehci))
+ *hw_p = *shadow_next_periodic(ehci, &here,
+ Q_NEXT_TYPE(ehci, *hw_p));
+ else
+ *hw_p = ehci->dummy->qh_dma;
}
/* how many of the uframe's 125 usecs are allocated? */
@@ -2335,7 +2342,11 @@ restart:
* pointer for much longer, if at all.
*/
*q_p = q.itd->itd_next;
- *hw_p = q.itd->hw_next;
+ if (!ehci->use_dummy_qh ||
+ q.itd->hw_next != EHCI_LIST_END(ehci))
+ *hw_p = q.itd->hw_next;
+ else
+ *hw_p = ehci->dummy->qh_dma;
type = Q_NEXT_TYPE(ehci, q.itd->hw_next);
wmb();
modified = itd_complete (ehci, q.itd);
@@ -2368,7 +2379,11 @@ restart:
* URB completion.
*/
*q_p = q.sitd->sitd_next;
- *hw_p = q.sitd->hw_next;
+ if (!ehci->use_dummy_qh ||
+ q.sitd->hw_next != EHCI_LIST_END(ehci))
+ *hw_p = q.sitd->hw_next;
+ else
+ *hw_p = ehci->dummy->qh_dma;
type = Q_NEXT_TYPE(ehci, q.sitd->hw_next);
wmb();
modified = sitd_complete (ehci, q.sitd);