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PM / wakeup: Register wakeup class kobj after device is added

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The device_set_wakeup_enable() function can be called on a device that
hasn't been registered with device_add() yet. This allows the device to
be in a state where wakeup is enabled for it but the device isn't
published to userspace in sysfs yet.

After commit c8377adfa7 ("PM / wakeup: Show wakeup sources stats in
sysfs"), calling device_set_wakeup_enable() will fail for a device that
hasn't been registered with the driver core via device_add(). This is
because we try to create sysfs entries for the device and associate a
wakeup class kobject with it before the device has been registered.
Let's follow a similar approach that device_set_wakeup_capable() takes
here and register the wakeup class either from
device_set_wakeup_enable() when the device is already registered, or
from dpm_sysfs_add() when the device is being registered with the driver
core via device_add().

Fixes: c8377adfa7 ("PM / wakeup: Show wakeup sources stats in sysfs")
Reported-by: Qian Cai <cai@lca.pw>
Reviewed-by: Tri Vo <trong@android.com>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Stephen Boyd 2019-08-19 15:41:57 -07:00 committed by Rafael J. Wysocki
parent ae367b7936
commit 2ca3d1ecb8
4 changed files with 34 additions and 4 deletions
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9
drivers/base/power/power.h
View File

@ -157,4 +157,13 @@ extern int wakeup_source_sysfs_add(struct device *parent,
struct wakeup_source *ws);
extern void wakeup_source_sysfs_remove(struct wakeup_source *ws);
extern int pm_wakeup_source_sysfs_add(struct device *parent);
#else /* !CONFIG_PM_SLEEP */
static inline int pm_wakeup_source_sysfs_add(struct device *parent)
{
return 0;
}
#endif /* CONFIG_PM_SLEEP */

6
drivers/base/power/sysfs.c
View File

@ -5,6 +5,7 @@
#include <linux/export.h>
#include <linux/pm_qos.h>
#include <linux/pm_runtime.h>
#include <linux/pm_wakeup.h>
#include <linux/atomic.h>
#include <linux/jiffies.h>
#include "power.h"
@ -667,8 +668,13 @@ int dpm_sysfs_add(struct device *dev)
if (rc)
goto err_wakeup;
}
rc = pm_wakeup_source_sysfs_add(dev);
if (rc)
goto err_latency;
return 0;
err_latency:
sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
err_wakeup:
sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
err_runtime:

10
drivers/base/power/wakeup.c
View File

@ -220,10 +220,12 @@ struct wakeup_source *wakeup_source_register(struct device *dev,
ws = wakeup_source_create(name);
if (ws) {
ret = wakeup_source_sysfs_add(dev, ws);
if (ret) {
wakeup_source_free(ws);
return NULL;
if (!dev || device_is_registered(dev)) {
ret = wakeup_source_sysfs_add(dev, ws);
if (ret) {
wakeup_source_free(ws);
return NULL;
}
}
wakeup_source_add(ws);
}

13
drivers/base/power/wakeup_stats.c
View File

@ -184,6 +184,19 @@ int wakeup_source_sysfs_add(struct device *parent, struct wakeup_source *ws)
}
EXPORT_SYMBOL_GPL(wakeup_source_sysfs_add);
/**
* pm_wakeup_source_sysfs_add - Add wakeup_source attributes to sysfs
* for a device if they're missing.
* @parent: Device given wakeup source is associated with
*/
int pm_wakeup_source_sysfs_add(struct device *parent)
{
if (!parent->power.wakeup || parent->power.wakeup->dev)
return 0;
return wakeup_source_sysfs_add(parent, parent->power.wakeup);
}
/**
* wakeup_source_sysfs_remove - Remove wakeup_source attributes from sysfs.
* @ws: Wakeup source to be removed from sysfs.