From: Jean-Christophe Dubois jcd@tribudubois.net
[ 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 jcd@tribudubois.net Reviewed-by: Fabio Estevam fabio.estevam@nxp.com Signed-off-by: Eduardo Valentin edubezval@gmail.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- drivers/thermal/imx_thermal.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c index 334d98be03b9..b1f82d64253e 100644 --- a/drivers/thermal/imx_thermal.c +++ b/drivers/thermal/imx_thermal.c @@ -604,7 +604,10 @@ static int imx_init_from_nvmem_cells(struct platform_device *pdev) 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)