Re: [PATCH 1/4] PM / Domains: Use the base device for driver_deferred_probe_check_state()

Viresh Kumar
2019-04-25T09:40:04Z

On 25-04-19, 11:04, Ulf Hansson wrote:
> When genpd fails to attach a device to one of its multiple PM domains, we
> end up calling driver_deferred_probe_check_state() for the recently
> allocated virtual device. This is wrong, as it's the base device that is
> being probed. Fix this, by passing along the base device to
> __genpd_dev_pm_attach() and use that instead.
>
> Fixes: e01afc325025 ("PM / Domains: Stop deferring probe at the end of initcall")
> Cc: Rob Herring <robh@kernel.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
> drivers/base/power/domain.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index 8362dfe187f5..8aca1c9b4406 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2405,8 +2405,8 @@ static void genpd_dev_pm_sync(struct device *dev)
> genpd_queue_power_off_work(pd);
> }
>
> -static int __genpd_dev_pm_attach(struct device *dev, unsigned int index,
> - bool power_on)
> +static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
> + unsigned int index, bool power_on)
> {
> struct of_phandle_args pd_args;
> struct generic_pm_domain *pd;
> @@ -2424,7 +2424,7 @@ static int __genpd_dev_pm_attach(struct device *dev, unsigned int index,
> mutex_unlock(&gpd_list_lock);
> dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
> __func__, PTR_ERR(pd));
> - return driver_deferred_probe_check_state(dev);
> + return driver_deferred_probe_check_state(base_dev);
> }
>
> dev_dbg(dev, "adding to PM domain %s\n", pd->name);
> @@ -2480,7 +2480,7 @@ int genpd_dev_pm_attach(struct device *dev)
> "#power-domain-cells") != 1)
> return 0;
>
> - return __genpd_dev_pm_attach(dev, 0, true);
> + return __genpd_dev_pm_attach(dev, dev, 0, true);
> }
> EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
>
> @@ -2533,7 +2533,7 @@ struct device *genpd_dev_pm_attach_by_id(struct device *dev,
> }
>
> /* Try to attach the device to the PM domain at the specified index. */
> - ret = __genpd_dev_pm_attach(virt_dev, index, false);
> + ret = __genpd_dev_pm_attach(virt_dev, dev, index, false);
> if (ret < 1) {
> device_unregister(virt_dev);
> return ret ? ERR_PTR(ret) : NULL;

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

--
viresh