4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: "Jason J. Herne" <[email protected]> [ Upstream commit 408358b50deaf59b07c82a7bff8c7e7cce031fae ] Because we do not make use of the cda (channel data address) for test, no-op ccws no address translation takes place. This means cda could contain a guest address which we do not want to attempt to free. Let's check the command type and skip cda free when it is not needed. For a TIC ccw, ccw->cda points to either a ccw in an existing chain or it points to a whole new allocated chain. In either case the data will be freed when the owning chain is freed. Signed-off-by: Jason J. Herne <[email protected]> Reviewed-by: Dong Jia Shi <[email protected]> Reviewed-by: Pierre Morel <[email protected]> Message-Id: <[email protected]> Reviewed-by: Halil Pasic <[email protected]> Acked-by: Christian Borntraeger <[email protected]> Signed-off-by: Cornelia Huck <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/s390/cio/vfio_ccw_cp.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -330,6 +330,8 @@ static void ccwchain_cda_free(struct ccw { struct ccw1 *ccw = chain->ch_ccw + idx; + if (ccw_is_test(ccw) || ccw_is_noop(ccw) || ccw_is_tic(ccw)) + return; if (!ccw->count) return;
