[PATCH v2 4/9] s390/cio: Use generalized CCW handler in cp_init()

Eric Farman
2019-06-06T20:28:40Z

It is now pretty apparent that ccwchain_handle_ccw()
(nee ccwchain_handle_tic()) does everything that cp_init()
wants to do.

Let's remove that duplicated code from cp_init() and let
ccwchain_handle_ccw() handle it itself.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
---
drivers/s390/cio/vfio_ccw_cp.c | 27 ++++-----------------------
1 file changed, 4 insertions(+), 23 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c
index 52735cdb0270..5b98bea433b7 100644
--- a/drivers/s390/cio/vfio_ccw_cp.c
+++ b/drivers/s390/cio/vfio_ccw_cp.c
@@ -744,9 +744,7 @@ static int ccwchain_fetch_one(struct ccwchain *chain,
*/
int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb)
{
- u64 iova = orb->cmd.cpa;
- struct ccwchain *chain;
- int len, ret;
+ int ret;

/*
* XXX:
@@ -759,28 +757,11 @@ int cp_init(struct channel_program *cp, struct device *mdev, union orb *orb)
memcpy(&cp->orb, orb, sizeof(*orb));
cp->mdev = mdev;

- /* Get chain length. */
- len = ccwchain_calc_length(iova, cp);
- if (len < 0)
- return len;
-
- /* Alloc mem for the head chain. */
- chain = ccwchain_alloc(cp, len);
- if (!chain)
- return -ENOMEM;
- chain->ch_iova = iova;
-
- /* Copy the head chain from guest. */
- ret = copy_ccw_from_iova(cp, chain->ch_ccw, iova, len);
- if (ret) {
- ccwchain_free(chain);
- return ret;
- }
-
- /* Now loop for its TICs. */
- ret = ccwchain_loop_tic(chain, cp);
+ /* Build a ccwchain for the first CCW segment */
+ ret = ccwchain_handle_ccw(orb->cmd.cpa, cp);
if (ret)
cp_free(cp);
+
/* It is safe to force: if not set but idals used
* ccwchain_calc_length returns an error.
*/
--
2.17.1