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authorSebastian Ott <sebott@linux.vnet.ibm.com>2008-12-25 13:39:13 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:39:10 +0100
commit13952ec12dfeea793ff83c2a96139ed57eb0b897 (patch)
tree3311df62a1794bf95f78b2c57f25f0a79dc84523 /drivers/s390/cio/device_fsm.c
parentcdb912a40df8b8507ab60b3d52f9980c0ba1f44d (diff)
[S390] cio: introduce cio_commit_config
To change the configuration of a subchannel we alter the modifiable bits of the subchannel's schib field and issue a modify subchannel. There can be the case that not all changes were applied -or worse- quietly overwritten by the hardware. With the next store subchannel we obtain the current state of the hardware but lose our target configuration. With this patch we introduce a subchannel_config structure which contains the target subchannel configuration. Additionally the msch wrapper cio_modify is replaced with cio_commit_config which copies the desired changes to a temporary schib. msch is then called with the temporary schib. This schib is only written back to the subchannel if all changes were applied. Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/device_fsm.c')
-rw-r--r--drivers/s390/cio/device_fsm.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/s390/cio/device_fsm.c b/drivers/s390/cio/device_fsm.c
index e1a3786779ba..9e249675c98d 100644
--- a/drivers/s390/cio/device_fsm.c
+++ b/drivers/s390/cio/device_fsm.c
@@ -1026,11 +1026,12 @@ void ccw_device_trigger_reprobe(struct ccw_device *cdev)
* we have before performing device selection :/
*/
sch->lpm = sch->schib.pmcw.pam & sch->opm;
- /* Re-set some bits in the pmcw that were lost. */
- sch->schib.pmcw.csense = 1;
- sch->schib.pmcw.ena = 0;
- if ((sch->lpm & (sch->lpm - 1)) != 0)
- sch->schib.pmcw.mp = 1;
+ /*
+ * Use the initial configuration since we can't be shure that the old
+ * paths are valid.
+ */
+ io_subchannel_init_config(sch);
+
/* We should also udate ssd info, but this has to wait. */
/* Check if this is another device which appeared on the same sch. */
if (sch->schib.pmcw.dev != cdev->private->dev_id.devno) {