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.
Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
Cc: Kevin Hilman <khil...@kernel.org>
Cc: Ulf Hansson <ulf.hans...@linaro.org>
Signed-off-by: Sudeep Holla <sudeep.ho...@arm.com>
---
drivers/base/power/domain.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index da49a8383dc3..b195d34de888 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1168,8 +1168,6 @@ static struct generic_pm_domain_data
*genpd_alloc_dev_data(struct device *dev,
spin_unlock_irq(&dev->power.lock);
- dev_pm_domain_set(dev, &genpd->domain);
-
return gpd_data;
err_free:
@@ -1221,6 +1219,8 @@ static int genpd_add_device(struct generic_pm_domain
*genpd, struct device *dev,
if (ret)
goto out;
+ dev_pm_domain_set(dev, &genpd->domain);
+
genpd->device_count++;
genpd->max_off_time_changed = true;
--
2.7.4
