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xhci: unify cycle state toggling operation with 'XOR'

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Some toggling operation in xHCI driver still use conditional toggling:
ring->cycle_state = (ring->cycle_state ? 0 : 1);

Use XOR to invert the cycle state instead of a conditional toggle to unify
cycle state toggling operation in xHCI driver.

Signed-off-by: Lin Wang <lin.x.wang@intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lin Wang 2015-03-17 18:32:21 +02:00 committed by Greg Kroah-Hartman
parent 8f7e9473ab
commit e5401bf37a
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/host/xhci-ring.c
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@ -238,7 +238,7 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring,
/* Toggle the cycle bit after the last ring segment. */
if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
ring->cycle_state = (ring->cycle_state ? 0 : 1);
ring->cycle_state ^= 1;
}
}
ring->enq_seg = ring->enq_seg->next;
@ -2809,7 +2809,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring,
/* Toggle the cycle bit after the last ring segment. */
if (last_trb_on_last_seg(xhci, ring, ring->enq_seg, next)) {
ring->cycle_state = (ring->cycle_state ? 0 : 1);
ring->cycle_state ^= 1;
}
ring->enq_seg = ring->enq_seg->next;
ring->enqueue = ring->enq_seg->trbs;