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>

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index a1abe16..7666a1c 100644 (file)
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1947,7 +1947,10 @@ static void genpd_dev_pm_sync(struct device *dev)
  * Both generic and legacy Samsung-specific DT bindings are supported to keep
  * backwards compatibility with existing DTBs.
  *
- * Returns 0 on successfully attached PM domain or negative error code.
+ * Returns 0 on successfully attached PM domain or negative error code. Note
+ * that if a power-domain exists for the device, but it cannot be found or
+ * turned on, then return -EPROBE_DEFER to ensure that the device is not
+ * probed and to re-try again later.
  */
 int genpd_dev_pm_attach(struct device *dev)
 {
@@ -1984,7 +1987,7 @@ int genpd_dev_pm_attach(struct device *dev)
                dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
                        __func__, PTR_ERR(pd));
                of_node_put(dev->of_node);
-               return PTR_ERR(pd);
+               return -EPROBE_DEFER;
        }
 
        dev_dbg(dev, "adding to PM domain %s\n", pd->name);
@@ -2002,14 +2005,15 @@ int genpd_dev_pm_attach(struct device *dev)
                dev_err(dev, "failed to add to PM domain %s: %d",
                        pd->name, ret);
                of_node_put(dev->of_node);
-               return ret;
+               goto out;
        }
 
        dev->pm_domain->detach = genpd_dev_pm_detach;
        dev->pm_domain->sync = genpd_dev_pm_sync;
-       pm_genpd_poweron(pd);
+       ret = pm_genpd_poweron(pd);
 
-       return 0;
+out:
+       return ret ? -EPROBE_DEFER : 0;
 }
 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */