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s390/cpum_sf: do not register PMU if no sampling mode is authorized 

Previously, the cpum_sf PMU was registered even if there is no
sampling mode authorized.  Add a check and register cpum_sf only
at least one sampling mode is authorized.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2017-05-31 15:22:19 +02:00 committed by Martin Schwidefsky
parent 3d43b981eb
commit 9232c3c741
1 changed files with 3 additions and 0 deletions
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3
arch/s390/kernel/perf_cpum_sf.c
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@ -1938,6 +1938,9 @@ static int __init init_cpum_sampling_pmu(void)
return -ENODEV;
}
if (!si.as && !si.ad)
return -ENODEV;
if (si.bsdes != sizeof(struct hws_basic_entry)) {
pr_cpumsf_err(RS_INIT_FAILURE_BSDES);
return -EINVAL;