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Subject[PATCH 4.18 046/228] thermal: i.MX: Allow thermal probe to fail gracefully in case of bad calibration.
4.18-stable review patch.  If anyone has any objections, please let me know.


From: Jean-Christophe Dubois <>

[ Upstream commit be926ceeb4efc3bf44cb9b56f5c71aac9b1f8bbe ]

Without this fix, the thermal probe on i.MX6 might trigger a division
by zero exception later in the probe if the calibration does fail.

Note: This linux behavior (Division by zero in kernel) has been triggered
on a Qemu i.MX6 emulation where parameters in nvmem were not set. With this
fix the division by zero is not triggeed anymore as the thermal probe does
fail early.

Signed-off-by: Jean-Christophe Dubois <>
Reviewed-by: Fabio Estevam <>
Signed-off-by: Eduardo Valentin <>
Signed-off-by: Sasha Levin <>
Signed-off-by: Greg Kroah-Hartman <>
drivers/thermal/imx_thermal.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -604,7 +604,10 @@ static int imx_init_from_nvmem_cells(str
ret = nvmem_cell_read_u32(&pdev->dev, "calib", &val);
if (ret)
return ret;
- imx_init_calib(pdev, val);
+ ret = imx_init_calib(pdev, val);
+ if (ret)
+ return ret;

ret = nvmem_cell_read_u32(&pdev->dev, "temp_grade", &val);
if (ret)

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