From edbdabc62328ec0ac98d83ca384bf9fd5251ade6 Mon Sep 17 00:00:00 2001 From: Adam Lessnau Date: Thu, 1 Jun 2017 11:21:50 +0200 Subject: [PATCH] powercap/RAPL: prevent overridding bits outside of the mask Fixes wrong bits shift operation in the rapl_write_data_raw function, which might cause overridding bits outside of the mask. For example, writing new TIME_WINDOW1 value can override POWER_LIMIT1. Signed-off-by: Adam Lessnau Signed-off-by: Rafael J. Wysocki --- drivers/powercap/intel_rapl.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c index 9ddad0815ba9..d1694f1def72 100644 --- a/drivers/powercap/intel_rapl.c +++ b/drivers/powercap/intel_rapl.c @@ -874,7 +874,9 @@ static int rapl_write_data_raw(struct rapl_domain *rd, cpu = rd->rp->lead_cpu; bits = rapl_unit_xlate(rd, rp->unit, value, 1); - bits |= bits << rp->shift; + bits <<= rp->shift; + bits &= rp->mask; + memset(&ma, 0, sizeof(ma)); ma.msr_no = rd->msrs[rp->id]; -- 2.20.1