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| author | Sarah Sharp | 2011-02-24 03:13:43 +0100 |
|---|---|---|
| committer | Sarah Sharp | 2011-03-14 02:23:56 +0100 |
| commit | ba0a4d9aaae789a6a632968b27c21d49b858b13a (patch) | |
| tree | 22e76438fe70720fa89d683586009cc028bceb0e /drivers/usb | |
| parent | xhci: Fix cycle bit calculation during stall handling. (diff) | |
| download | kernel-qcow2-linux-ba0a4d9aaae789a6a632968b27c21d49b858b13a.tar.gz kernel-qcow2-linux-ba0a4d9aaae789a6a632968b27c21d49b858b13a.tar.xz kernel-qcow2-linux-ba0a4d9aaae789a6a632968b27c21d49b858b13a.zip | |
xhci: Clean up cycle bit math used during stalls.
Use XOR to invert the cycle bit, instead of a more complicated
calculation. Eliminate a check for the link TRB type in find_trb_seg().
We know that there will always be a link TRB at the end of a segment, so
xhci_segment->trbs[TRBS_PER_SEGMENT - 1] will always have a link TRB type.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/host/xhci-ring.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index cf86eb70a62e..032af7e8a6bf 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -380,10 +380,8 @@ static struct xhci_segment *find_trb_seg( while (cur_seg->trbs > trb || &cur_seg->trbs[TRBS_PER_SEGMENT - 1] < trb) { generic_trb = &cur_seg->trbs[TRBS_PER_SEGMENT - 1].generic; - if ((generic_trb->field[3] & TRB_TYPE_BITMASK) == - TRB_TYPE(TRB_LINK) && - (generic_trb->field[3] & LINK_TOGGLE)) - *cycle_state = ~(*cycle_state) & 0x1; + if (generic_trb->field[3] & LINK_TOGGLE) + *cycle_state ^= 0x1; cur_seg = cur_seg->next; if (cur_seg == start_seg) /* Looped over the entire list. Oops! */ @@ -492,7 +490,7 @@ void xhci_find_new_dequeue_state(struct xhci_hcd *xhci, trb = &state->new_deq_ptr->generic; if ((trb->field[3] & TRB_TYPE_BITMASK) == TRB_TYPE(TRB_LINK) && (trb->field[3] & LINK_TOGGLE)) - state->new_cycle_state = ~(state->new_cycle_state) & 0x1; + state->new_cycle_state ^= 0x1; next_trb(xhci, ep_ring, &state->new_deq_seg, &state->new_deq_ptr); /* |