From: Sascha Hauer <s.hauer@pengutronix.de>
Date: Mon, 6 Jul 2015 07:46:17 +0000 (+0200)
Subject: thermal: Add comment explaining test for critical temperature
X-Git-Tag: firefly_0821_release~176^2~1077^2^2
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=934c93b8c193b62fc86256ea64aef65e9a7b4e9e;p=firefly-linux-kernel-4.4.55.git

thermal: Add comment explaining test for critical temperature

The code testing if a temperature should be emulated or not is
not obvious. Add a comment explaining why this test is done.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
---

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 9599465abeac..6a707789746b 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -498,6 +498,11 @@ int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
 			}
 		}
 
+		/*
+		 * Only allow emulating a temperature when the real temperature
+		 * is below the critical temperature so that the emulation code
+		 * cannot hide critical conditions.
+		 */
 		if (!ret && *temp < crit_temp)
 			*temp = tz->emul_temperature;
 	}