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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2008-12-25 15:39:12 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-12-25 15:39:10 +0300 |
| commit | cdb912a40df8b8507ab60b3d52f9980c0ba1f44d (patch) | |
| tree | 52d693b3515b71b4f84b539d41571facb75498db /drivers/s390/cio/cio.h | |
| parent | d6a30761d8116b8de8a5b5e79e68cce81d36414b (diff) | |
| download | linux-cdb912a40df8b8507ab60b3d52f9980c0ba1f44d.tar.xz | |
[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.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/cio/cio.h b/drivers/s390/cio/cio.h index 5db887e8f032..fb125efd6891 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); |