4.4-stable review patch. If anyone has any objections, please let me know.
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From: Mikhail Lappo mikhail.lappo@esrlabs.com
commit cf1ba1d73a33944d8c1a75370a35434bf146b8a7 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/thermal/imx_thermal.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/thermal/imx_thermal.c +++ b/drivers/thermal/imx_thermal.c @@ -589,6 +589,9 @@ static int imx_thermal_probe(struct plat 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); @@ -600,9 +603,6 @@ static int imx_thermal_probe(struct plat return ret; }
- data->irq_enabled = true; - data->mode = THERMAL_DEVICE_ENABLED; - return 0; }