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thermal: Do not log an error if thermal_zone_get_temp returns -EAGAIN

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Some temperature sensors only get updated every few seconds and while
waiting for the first irq reporting a (new) temperature to happen there
get_temp operand will return -EAGAIN as it does not have any data to report
yet.

Not logging an error in this case avoids messages like these from showing
up in dmesg on affected systems:

[    1.219353] thermal thermal_zone0: failed to read out thermal zone 0
[    2.015433] thermal thermal_zone0: failed to read out thermal zone 0
[    2.416737] thermal thermal_zone0: failed to read out thermal zone 0

Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
This commit is contained in:
Hans de Goede 2015-03-21 15:02:55 +01:00 committed by Eduardo Valentin
parent 2771d00081
commit 7e497a7375
1 changed files with 4 additions and 2 deletions
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6
drivers/thermal/thermal_core.c
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@ -458,8 +458,10 @@ static void update_temperature(struct thermal_zone_device *tz)
ret = thermal_zone_get_temp(tz, &temp);
if (ret) {
dev_warn(&tz->device, "failed to read out thermal zone %d\n",
tz->id);
if (ret != -EAGAIN)
dev_warn(&tz->device,
"failed to read out thermal zone (%d)\n",
ret);
return;
}