linux-kernel - [PATCH 05/15] thermal: Add comment explaining test for critical temperature

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Message-Id: <1431507163-19933-6-git-send-email-s.hauer@pengutronix.de>
Date:	Wed, 13 May 2015 10:52:33 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	linux-pm@...r.kernel.org
Cc:	Zhang Rui <rui.zhang@...el.com>,
	Eduardo Valentin <edubezval@...il.com>,
	linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	Mikko Perttunen <mikko.perttunen@...si.fi>,
	kernel@...gutronix.de, linux-mediatek@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org,
	Brian Norris <computersforpeace@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>
Subject: [PATCH 05/15] 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@...gutronix.de>
---
 drivers/thermal/thermal_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 3e0fe55..e204deb 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -435,6 +435,11 @@ 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;
 	}
-- 
2.1.4

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