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USB: xhci: Fix Link TRB handoff bit twiddling.

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Make sure to preserve all bits *except* the TRB_CHAIN bit when giving a
Link TRB to the hardware.  We need to save things like TRB type and the
toggle bit in the control dword.

Signed-off-by: Sarah Sharp <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Sarah Sharp 2009-04-29 19:04:59 -07:00 • committed by Greg Kroah-Hartman
commit 06e7a1487b
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/host/xhci-ring.c
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@ -188,7 +188,7 @@ static void inc_enq(struct xhci_hcd *xhci, struct xhci_ring *ring, bool consumer
next->link.control &= (u32) ~TRB_CYCLE;
else
next->link.control |= (u32) TRB_CYCLE;
next->link.control &= TRB_CHAIN;
next->link.control &= ~TRB_CHAIN;
next->link.control |= chain;
}
/* Toggle the cycle bit after the last ring segment. */