PM / Domains: Return -EPROBE_DEFER if we fail to init or turn-on domain
When a device is probed, the function dev_pm_domain_attach() is called to see if there is a power-domain that is associated with the device and needs to be turned on. If dev_pm_domain_attach() does not return -EPROBE_DEFER then the device will be probed. For devices using genpd, dev_pm_domain_attach() will call genpd_dev_pm_attach(). If genpd_dev_pm_attach() does not find a power domain associated with the device then it returns an error code not equal to -EPROBE_DEFER to allow the device to be probed. However, if genpd_dev_pm_attach() does find a power-domain that is associated with the device, then it does not return -EPROBE_DEFER on failure and hence the device will still be probed. Furthermore, genpd_dev_pm_attach() does not check the error code returned by pm_genpd_poweron() to see if the power-domain was turned on successfully. Fix this by checking the return code from pm_genpd_poweron() and returning -EPROBE_DEFER from genpd_dev_pm_attach on failure, if there is a power-domain associated with the device. Signed-off-by: Jon Hunter <jonathanh@nvidia.com> Acked-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -1947,7 +1947,10 @@ static void genpd_dev_pm_sync(struct device *dev)
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* Both generic and legacy Samsung-specific DT bindings are supported to keep
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* backwards compatibility with existing DTBs.
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*
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* Returns 0 on successfully attached PM domain or negative error code.
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* Returns 0 on successfully attached PM domain or negative error code. Note
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* that if a power-domain exists for the device, but it cannot be found or
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* turned on, then return -EPROBE_DEFER to ensure that the device is not
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* probed and to re-try again later.
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*/
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int genpd_dev_pm_attach(struct device *dev)
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{
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@ -1984,7 +1987,7 @@ int genpd_dev_pm_attach(struct device *dev)
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dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
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__func__, PTR_ERR(pd));
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of_node_put(dev->of_node);
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return PTR_ERR(pd);
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return -EPROBE_DEFER;
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}
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dev_dbg(dev, "adding to PM domain %s\n", pd->name);
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@ -2002,14 +2005,15 @@ int genpd_dev_pm_attach(struct device *dev)
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dev_err(dev, "failed to add to PM domain %s: %d",
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pd->name, ret);
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of_node_put(dev->of_node);
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return ret;
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goto out;
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}
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dev->pm_domain->detach = genpd_dev_pm_detach;
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dev->pm_domain->sync = genpd_dev_pm_sync;
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pm_genpd_poweron(pd);
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ret = pm_genpd_poweron(pd);
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return 0;
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out:
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return ret ? -EPROBE_DEFER : 0;
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}
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EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
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#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
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