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authorMikhail Lappo <mikhail.lappo@esrlabs.com>2018-02-02 16:17:46 -0200
committerZhang Rui <rui.zhang@intel.com>2018-03-14 15:14:40 +0800
commitcf1ba1d73a33944d8c1a75370a35434bf146b8a7 (patch)
tree5d893a5865b7b4a83bed362426c014c9a08a7427 /drivers/thermal
parent0c8efd610b58cb23cefdfa12015799079aef94ae (diff)
thermal: imx: Fix race condition in imx_thermal_probe()
When device boots with T > T_trip_1 and requests interrupt, the race condition takes place. The interrupt comes before THERMAL_DEVICE_ENABLED is set. This leads to an attempt to reading sensor value from irq and disabling the sensor, based on the data->mode field, which expected to be THERMAL_DEVICE_ENABLED, but still stays as THERMAL_DEVICE_DISABLED. Afher this issue sensor is never re-enabled, as the driver state is wrong. Fix this problem by setting the 'data' members prior to requesting the interrupts. Fixes: 37713a1e8e4c ("thermal: imx: implement thermal alarm interrupt handling") Cc: <stable@vger.kernel.org> Signed-off-by: Mikhail Lappo <mikhail.lappo@esrlabs.com> Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Acked-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Diffstat (limited to 'drivers/thermal')
-rw-r--r--drivers/thermal/imx_thermal.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index a67781b7a0b2..ee3a215b333a 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -637,6 +637,9 @@ static int imx_thermal_probe(struct platform_device *pdev)
regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
+ data->irq_enabled = true;
+ data->mode = THERMAL_DEVICE_ENABLED;
+
ret = devm_request_threaded_irq(&pdev->dev, data->irq,
imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
0, "imx_thermal", data);
@@ -649,9 +652,6 @@ static int imx_thermal_probe(struct platform_device *pdev)
return ret;
}
- data->irq_enabled = true;
- data->mode = THERMAL_DEVICE_ENABLED;
-
return 0;
}