diff options
author | Ingo Molnar <mingo@kernel.org> | 2012-07-18 11:17:17 +0200 |
---|---|---|
committer | Ingo Molnar <mingo@kernel.org> | 2012-07-18 11:17:17 +0200 |
commit | a2fe194723f6e4990d01d8c208c7b138fd410522 (patch) | |
tree | 7aee93fa8f4ba1e18b56fa7d8eab75d249fc6966 /drivers/usb/host/xhci-ring.c | |
parent | c3b7cdf180090d2686239a75bb0ae408108ed749 (diff) | |
parent | a018540141a931f5299a866907b27886916b4374 (diff) |
Merge branch 'linus' into perf/core
Pick up the latest ring-buffer fixes, before applying a new fix.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
-rw-r--r-- | drivers/usb/host/xhci-ring.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 23b4aefd1036..8275645889da 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -885,6 +885,17 @@ static void update_ring_for_set_deq_completion(struct xhci_hcd *xhci, num_trbs_free_temp = ep_ring->num_trbs_free; dequeue_temp = ep_ring->dequeue; + /* If we get two back-to-back stalls, and the first stalled transfer + * ends just before a link TRB, the dequeue pointer will be left on + * the link TRB by the code in the while loop. So we have to update + * the dequeue pointer one segment further, or we'll jump off + * the segment into la-la-land. + */ + if (last_trb(xhci, ep_ring, ep_ring->deq_seg, ep_ring->dequeue)) { + ep_ring->deq_seg = ep_ring->deq_seg->next; + ep_ring->dequeue = ep_ring->deq_seg->trbs; + } + while (ep_ring->dequeue != dev->eps[ep_index].queued_deq_ptr) { /* We have more usable TRBs */ ep_ring->num_trbs_free++; |