USB: OHCI: fix logic for scheduling isochronous URBs
authorAlan Stern <stern@rowland.harvard.edu>
Tue, 14 May 2013 17:57:51 +0000 (13:57 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 15 May 2013 17:42:45 +0000 (13:42 -0400)
commit815fa7b917614261748d1ecd9600ff27f99508e5
treed7f02412eaabbf21faa91ca44366d8be76147537
parente1944017839d7dfbf7329fac4bdec8b4050edf5e
USB: OHCI: fix logic for scheduling isochronous URBs

The isochronous scheduling logic in ohci-hcd has a bug.  The
calculation for skipping TDs that are too late should be carried out
only in the !URB_ISO_ASAP case.  When URB_ISO_ASAP is set, the URB is
pushed back so that none of the TDs are too late, which would cause
the calculation to overflow.

The patch also fixes the calculation to avoid overflow in the case
where the frame value wraps around.

This should be applied to -stable kernels going back to 3.8.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/host/ohci-hcd.c