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authorSebastian Ott <sebott@linux.vnet.ibm.com>2008-12-25 13:39:12 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2008-12-25 13:39:10 +0100
commitcdb912a40df8b8507ab60b3d52f9980c0ba1f44d (patch)
tree52d693b3515b71b4f84b539d41571facb75498db /drivers/s390/cio/cio.h
parentd6a30761d8116b8de8a5b5e79e68cce81d36414b (diff)
[S390] cio: introduce cio_update_schib
There is the chance that we get condition code 0 for a stsch but the resulting schib is not vaild. In the current code there are 2 cases: * we do a check for validity of the schib after stsch, but at this time we have already stored the invaild schib in the subchannel structure. This may lead to problems. * we don't do a check for validity, which is not that good either. The patch addresses both issues by introducing the stsch wrapper cio_update_schib which performs stsch on a local schib. This schib is only written back to the subchannel if it's valid. side note: For some functions (chp_events) the return codes are different now (-ENXIO vs -ENODEV) but this shouldn't do harm since the caller doesn't check for _specific_ errors. 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/cio.h')
-rw-r--r--drivers/s390/cio/cio.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h
index 5db887e8f03..fb125efd689 100644
--- a/drivers/s390/cio/cio.h
+++ b/drivers/s390/cio/cio.h
@@ -102,6 +102,7 @@ extern int cio_cancel (struct subchannel *);
extern int cio_set_options (struct subchannel *, int);
extern int cio_get_options (struct subchannel *);
extern int cio_modify (struct subchannel *);
+extern int cio_update_schib(struct subchannel *sch);
int cio_tm_start_key(struct subchannel *sch, struct tcw *tcw, u8 lpm, u8 key);
int cio_tm_intrg(struct subchannel *sch);