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authorPrarit Bhargava <prarit@redhat.com>2015-12-09 16:31:12 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-12-12 04:31:11 +0300
commit79a21dbfae3cd40d5a801778071a9967b79c2c20 (patch)
treec55b58db9379107290a0dc2bafe4f04530b707c0 /drivers/powercap
parent89e7b2553ae182a4b2a19e2e99a59ad0d3ccb1ed (diff)
downloadlinux-79a21dbfae3cd40d5a801778071a9967b79c2c20.tar.xz
powercap / RAPL: fix BIOS lock check
Intel RAPL initialized on several systems where the BIOS lock bit (msr 0x610, bit 63) was set. This occured because the return value of rapl_read_data_raw() was being checked, rather than the value of the variable passed in, locked. This patch properly implments the rapl_read_data_raw() call to check the variable locked, and now the Intel RAPL driver outputs the warning: intel_rapl: RAPL package 0 domain package locked by BIOS and does not initialize for the package. Signed-off-by: Prarit Bhargava <prarit@redhat.com> Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Cc: All applicable <stable@vger.kernel.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/powercap')
-rw-r--r--drivers/powercap/intel_rapl.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index cc97f0869791..48747c28a43d 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -1341,10 +1341,13 @@ static int rapl_detect_domains(struct rapl_package *rp, int cpu)
for (rd = rp->domains; rd < rp->domains + rp->nr_domains; rd++) {
/* check if the domain is locked by BIOS */
- if (rapl_read_data_raw(rd, FW_LOCK, false, &locked)) {
+ ret = rapl_read_data_raw(rd, FW_LOCK, false, &locked);
+ if (ret)
+ return ret;
+ if (locked) {
pr_info("RAPL package %d domain %s locked by BIOS\n",
rp->id, rd->name);
- rd->state |= DOMAIN_STATE_BIOS_LOCKED;
+ rd->state |= DOMAIN_STATE_BIOS_LOCKED;
}
}