The patch below does not apply to the 4.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 975e83cfb8dc16e7a2fdc58188c77c0c605876c2 Mon Sep 17 00:00:00 2001
From: Sudeep Holla <Sudeep.Holla@xxxxxxx>
Date: Fri, 14 Jul 2017 11:51:48 +0100
Subject: [PATCH] PM / Domains: defer dev_pm_domain_set() until
genpd->attach_dev succeeds if present
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)
Cc: 4.4+ <stable@xxxxxxxxxxxxxxx> # v4.4+
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 2ac906288a6f..91ba82688f4c 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -1222,8 +1222,6 @@ 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:
@@ -1237,8 +1235,6 @@ static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
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;
@@ -1275,6 +1271,8 @@ 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;
@@ -1336,6 +1334,8 @@ static int genpd_remove_device(struct generic_pm_domain *genpd,
if (genpd->detach_dev)
genpd->detach_dev(genpd, dev);
+ dev_pm_domain_set(dev, NULL);
+
list_del_init(&pdd->list_node);
genpd_unlock(genpd);