From: "Jason J. Herne" <jjherne@xxxxxxxxxxxxxxxxxx> 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 <jjherne@xxxxxxxxxxxxxxxxxx> Reviewed-by: Dong Jia Shi <bjsdjshi@xxxxxxxxxxxxxxxxxx> Reviewed-by: Pierre Morel <pmorel@xxxxxxxxxxxxxxxxxx> Message-Id: <1510068152-21988-1-git-send-email-jjherne@xxxxxxxxxxxxxxxxxx> Reviewed-by: Halil Pasic <pasic@xxxxxxxxxxxxxxxxxx> Acked-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> Signed-off-by: Cornelia Huck <cohuck@xxxxxxxxxx> --- drivers/s390/cio/vfio_ccw_cp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index d8f98ad9b029..7ebbd8b482f5 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -332,6 +332,8 @@ static void ccwchain_cda_free(struct ccwchain *chain, int idx) { 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; -- 2.13.6 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html