From: Michael Brunner <mibru@xxxxxx>
The return value of the get_temp function is not checked when doing a
thermal zone update. This may lead to a critical shutdown if get_temp
fails and the content of the temp variable is incorrectly set higher than
the critical trip point.
This has been observed on a system with incorrect ACPI implementation
where the corresponding methods were not serialized and therefore
sometimes triggered ACPI errors (AE_ALREADY_EXISTS). The following
critical shutdowns indicated a temperature of 2097 C, which was obviously
wrong.
The patch adds a return value check that jumps over all trip point
evaluations printing a warning if get_temp fails. The trip points are
evaluated again on the next polling interval with successful get_temp
execution.
Signed-off-by: Michael Brunner <mibru@xxxxxx>
Acked-by: Zhang Rui <rui.zhang@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/thermal/thermal_sys.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff -puN drivers/thermal/thermal_sys.c~thermal_sys-check-get_temp-return-value drivers/thermal/thermal_sys.c
--- a/drivers/thermal/thermal_sys.c~thermal_sys-check-get_temp-return-value
+++ a/drivers/thermal/thermal_sys.c
@@ -953,7 +953,12 @@ void thermal_zone_device_update(struct t
mutex_lock(&tz->lock);
- tz->ops->get_temp(tz, &temp);
+ if (tz->ops->get_temp(tz, &temp)) {
+ /* get_temp failed - retry it later */
+ printk(KERN_WARNING PREFIX "failed to read out thermal zone "
+ "%d\n", tz->id);
+ goto leave;
+ }
for (count = 0; count < tz->trips; count++) {
tz->ops->get_trip_type(tz, count, &trip_type);
@@ -1005,6 +1010,8 @@ void thermal_zone_device_update(struct t
THERMAL_TRIPS_NONE);
tz->last_temperature = temp;
+
+ leave:
if (tz->passive)
thermal_zone_device_set_polling(tz, tz->passive_delay);
else if (tz->polling_delay)
_
--
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