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authorJacob Pan <jacob.jun.pan@linux.intel.com>2016-11-29 00:53:11 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2016-11-29 02:02:29 +0300
commitcb43f81b8489dcb87555e16c17453f0a9fa690f2 (patch)
treec2adf0174613051b37795eda564ef537dada9727 /drivers/powercap
parentb4005e9278a4e62819fb16ba4bc3430ca650d0ab (diff)
downloadlinux-cb43f81b8489dcb87555e16c17453f0a9fa690f2.tar.xz
powercap/intel_rapl: fix and tidy up error handling
Commit e1399ba20eee ("powercap / RAPL: handle missing MSRs") added contraint_to_pl() function to return index into an array. But it can potentially return -EINVAL if powercap layer sends an out of range constraint ID. This patch adds sanity check. Unnecessary RAPL domain pointer check is removed since it must be initialized before calling rapl_unit_xlate(). Fixes: e1399ba20eee ("powercap / RAPL: handle missing MSRs") Reported-by: Odzioba, Lukasz <lukasz.odzioba@intel.com> Reported-by: Koss, Marcin <marcin.koss@intel.com> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/powercap')
-rw-r--r--drivers/powercap/intel_rapl.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c
index 65ed88a28030..f6937d0b742e 100644
--- a/drivers/powercap/intel_rapl.c
+++ b/drivers/powercap/intel_rapl.c
@@ -429,6 +429,7 @@ static int contraint_to_pl(struct rapl_domain *rd, int cid)
return i;
}
}
+ pr_err("Cannot find matching power limit for constraint %d\n", cid);
return -EINVAL;
}
@@ -444,6 +445,10 @@ static int set_power_limit(struct powercap_zone *power_zone, int cid,
get_online_cpus();
rd = power_zone_to_rapl_domain(power_zone);
id = contraint_to_pl(rd, cid);
+ if (id < 0) {
+ ret = id;
+ goto set_exit;
+ }
rp = rd->rp;
@@ -483,6 +488,11 @@ static int get_current_power_limit(struct powercap_zone *power_zone, int cid,
get_online_cpus();
rd = power_zone_to_rapl_domain(power_zone);
id = contraint_to_pl(rd, cid);
+ if (id < 0) {
+ ret = id;
+ goto get_exit;
+ }
+
switch (rd->rpl[id].prim_id) {
case PL1_ENABLE:
prim = POWER_LIMIT1;
@@ -499,6 +509,7 @@ static int get_current_power_limit(struct powercap_zone *power_zone, int cid,
else
*data = val;
+get_exit:
put_online_cpus();
return ret;
@@ -514,6 +525,10 @@ static int set_time_window(struct powercap_zone *power_zone, int cid,
get_online_cpus();
rd = power_zone_to_rapl_domain(power_zone);
id = contraint_to_pl(rd, cid);
+ if (id < 0) {
+ ret = id;
+ goto set_time_exit;
+ }
switch (rd->rpl[id].prim_id) {
case PL1_ENABLE:
@@ -525,6 +540,8 @@ static int set_time_window(struct powercap_zone *power_zone, int cid,
default:
ret = -EINVAL;
}
+
+set_time_exit:
put_online_cpus();
return ret;
}
@@ -539,6 +556,10 @@ static int get_time_window(struct powercap_zone *power_zone, int cid, u64 *data)
get_online_cpus();
rd = power_zone_to_rapl_domain(power_zone);
id = contraint_to_pl(rd, cid);
+ if (id < 0) {
+ ret = id;
+ goto get_time_exit;
+ }
switch (rd->rpl[id].prim_id) {
case PL1_ENABLE:
@@ -553,6 +574,8 @@ static int get_time_window(struct powercap_zone *power_zone, int cid, u64 *data)
}
if (!ret)
*data = val;
+
+get_time_exit:
put_online_cpus();
return ret;
@@ -694,7 +717,7 @@ static u64 rapl_unit_xlate(struct rapl_domain *rd, enum unit_type type,
case ENERGY_UNIT:
scale = ENERGY_UNIT_SCALE;
/* per domain unit takes precedence */
- if (rd && rd->domain_energy_unit)
+ if (rd->domain_energy_unit)
units = rd->domain_energy_unit;
else
units = rp->energy_unit;