Re: [PATCH v3 4/9] drivers: thermal: tsens: Release device in success path

Bjorn Andersson
2020-01-02T19:29:30Z

On Thu 02 Jan 06:54 PST 2020, Amit Kucheria wrote:

> We don't currently call put_device in case of successfully initialising
> the device.
>
> Allow control to fall through so we can use same code for success and
> error paths to put_device.
>

Given the relationship between priv->dev and op I think this wouldn't be
a problem in practice, but there's two devm_ioremap_resource() done on
op->dev in this function. So you're depending on op->dev to stick
around, but with this patch you're no longer expressing that dependency.

That said, it looks iffy to do devm_ioremap_resource() on op->dev and
then create a regmap on priv->dev using that resource. So I think it
would be better to do platform_get_source() on op, and then
devm_ioremap_resource() on priv->dev, in which case the regmap backing
memory will be related to the same struct device as the regmap and it
makes perfect sense to put_device() the op->dev when you're done
inspecting it's resources.

Regards,
Bjorn

> Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
> ---
> drivers/thermal/qcom/tsens-common.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
> index 1cbc5a6e5b4f..e84e94a6f1a7 100644
> --- a/drivers/thermal/qcom/tsens-common.c
> +++ b/drivers/thermal/qcom/tsens-common.c
> @@ -687,8 +687,6 @@ int __init init_common(struct tsens_priv *priv)
> tsens_enable_irq(priv);
> tsens_debug_init(op);
>
> - return 0;
> -
> err_put_device:
> put_device(&op->dev);
> return ret;
> --
> 2.20.1
>