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vfio-ccw: fence off transport mode 

[ Upstream commit 9851bc77e6 ]

vfio-ccw only supports command mode for channel programs, not transport
mode. User space is supposed to already take care of that and pass us
command-mode ORBs only, but better make sure and return an error to
the caller instead of trying to process tcws as ccws.

Reviewed-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Acked-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Cornelia Huck 2018-02-22 15:35:43 +01:00 committed by Greg Kroah-Hartman
parent fe2fc07d2a
commit 7efeaf6d51
1 changed files with 5 additions and 0 deletions
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5
drivers/s390/cio/vfio_ccw_fsm.c
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@ -129,6 +129,11 @@ static void fsm_io_request(struct vfio_ccw_private *private,
if (scsw->cmd.fctl & SCSW_FCTL_START_FUNC) {
orb = (union orb *)io_region->orb_area;
/* Don't try to build a cp if transport mode is specified. */
if (orb->tm.b) {
io_region->ret_code = -EOPNOTSUPP;
goto err_out;
}
io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev),
orb);
if (io_region->ret_code)