Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 29/52] thermal: imx: Fix race condition in imx_thermal_probe() | Date | Sun, 22 Apr 2018 15:54:02 +0200 |
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3.18-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 @@ -493,6 +493,9 @@ static int imx_thermal_probe(struct plat if (data->irq < 0) return data->irq; + 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); @@ -576,9 +579,6 @@ 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; - return 0; }
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