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authorSebastian Ott <sebott@linux.vnet.ibm.com>2016-01-25 10:31:33 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2016-01-26 12:47:41 +0100
commit61f0bfcf8020f02eb09adaef96745d1c1d1b3623 (patch)
treef5e6630a4281f738b2d371f87fad6eb8cb682bfc /drivers/s390/cio/chsc.c
parent0d9bfe9123cfde59bf5c2e375b59d2a7d5061c4c (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.c12
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) {