diff options
| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2016-01-25 10:31:33 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-01-26 12:47:41 +0100 |
| commit | 61f0bfcf8020f02eb09adaef96745d1c1d1b3623 (patch) | |
| tree | f5e6630a4281f738b2d371f87fad6eb8cb682bfc /drivers/s390/cio/chsc.c | |
| parent | 0d9bfe9123cfde59bf5c2e375b59d2a7d5061c4c (diff) | |
s390/cio: ensure consistent measurement state
Make sure that in all cases where we could not obtain measurement
characteristics the associated fields are set to invalid values.
Note: without this change the "shared" capability of a channel path
for which we could not obtain the measurement characteristics was
incorrectly displayed as 0 (not shared). We will now correctly
report "unknown" in this case.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/cio/chsc.c')
| -rw-r--r-- | drivers/s390/cio/chsc.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/s390/cio/chsc.c b/drivers/s390/cio/chsc.c index 5df0efee54db..13747c510c0b 100644 --- a/drivers/s390/cio/chsc.c +++ b/drivers/s390/cio/chsc.c @@ -1003,6 +1003,12 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp) u32 data[NR_MEASUREMENT_CHARS]; } __attribute__ ((packed)) *scmc_area; + chp->shared = -1; + chp->cmg = -1; + + if (!css_chsc_characteristics.scmc || !css_chsc_characteristics.secm) + return 0; + spin_lock_irq(&chsc_page_lock); memset(chsc_page, 0, PAGE_SIZE); scmc_area = chsc_page; @@ -1023,11 +1029,9 @@ int chsc_get_channel_measurement_chars(struct channel_path *chp) scmc_area->response.code); goto out; } - if (scmc_area->not_valid) { - chp->cmg = -1; - chp->shared = -1; + if (scmc_area->not_valid) goto out; - } + chp->cmg = scmc_area->cmg; chp->shared = scmc_area->shared; if (chp->cmg != 2 && chp->cmg != 3) { |