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Subject[PATCH 4.12 190/196] PM / Domains: defer dev_pm_domain_set() until genpd->attach_dev succeeds if present
Date
4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sudeep Holla <Sudeep.Holla@arm.com>

commit 975e83cfb8dc16e7a2fdc58188c77c0c605876c2 upstream.

If the genpd->attach_dev or genpd->power_on fails, genpd_dev_pm_attach
may return -EPROBE_DEFER initially. However genpd_alloc_dev_data sets
the PM domain for the device unconditionally.

When subsequent attempts are made to call genpd_dev_pm_attach, it may
return -EEXISTS checking dev->pm_domain without re-attempting to call
attach_dev or power_on.

platform_drv_probe then attempts to call drv->probe as the return value
-EEXIST != -EPROBE_DEFER, which may end up in a situation where the
device is accessed without it's power domain switched on.

Fixes: f104e1e5ef57 (PM / Domains: Re-order initialization of generic_pm_domain_data)
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/base/power/domain.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1168,8 +1168,6 @@ static struct generic_pm_domain_data *ge

spin_unlock_irq(&dev->power.lock);

- dev_pm_domain_set(dev, &genpd->domain);
-
return gpd_data;

err_free:
@@ -1183,8 +1181,6 @@ static struct generic_pm_domain_data *ge
static void genpd_free_dev_data(struct device *dev,
struct generic_pm_domain_data *gpd_data)
{
- dev_pm_domain_set(dev, NULL);
-
spin_lock_irq(&dev->power.lock);

dev->power.subsys_data->domain_data = NULL;
@@ -1221,6 +1217,8 @@ static int genpd_add_device(struct gener
if (ret)
goto out;

+ dev_pm_domain_set(dev, &genpd->domain);
+
genpd->device_count++;
genpd->max_off_time_changed = true;

@@ -1282,6 +1280,8 @@ static int genpd_remove_device(struct ge
if (genpd->detach_dev)
genpd->detach_dev(genpd, dev);

+ dev_pm_domain_set(dev, NULL);
+
list_del_init(&pdd->list_node);

genpd_unlock(genpd);

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