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Driver core: Fix device_move() vs. dpm list ordering, v2

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dpm_list currently relies on the fact that child devices will
be registered after their parents to get a correct suspend
order. Using device_move() however destroys this assumption, as
an already registered device may be moved under a newly registered
one.

This patch adds a new argument to device_move(), allowing callers
to specify how dpm_list should be adapted.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Cornelia Huck
2009-03-04 12:44:00 +01:00
committed by Greg Kroah-Hartman
parent 60530afe1e
commit ffa6a7054d
8 changed files with 92 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/base/core.c
+18 -1
View File
@@ -1561,8 +1561,10 @@ out:
* device_move - moves a device to a new parent
* @dev: the pointer to the struct device to be moved
* @new_parent: the new parent of the device (can by NULL)
* @dpm_order: how to reorder the dpm_list
*/
int device_move(struct device *dev, struct device *new_parent)
int device_move(struct device *dev, struct device *new_parent,
enum dpm_order dpm_order)
{
int error;
struct device *old_parent;
@@ -1572,6 +1574,7 @@ int device_move(struct device *dev, struct device *new_parent)
if (!dev)
return -EINVAL;
device_pm_lock();
new_parent = get_device(new_parent);
new_parent_kobj = get_device_parent(dev, new_parent);
@@ -1613,9 +1616,23 @@ int device_move(struct device *dev, struct device *new_parent)
put_device(new_parent);
goto out;
}
switch (dpm_order) {
case DPM_ORDER_NONE:
break;
case DPM_ORDER_DEV_AFTER_PARENT:
device_pm_move_after(dev, new_parent);
break;
case DPM_ORDER_PARENT_BEFORE_DEV:
device_pm_move_before(new_parent, dev);
break;
case DPM_ORDER_DEV_LAST:
device_pm_move_last(dev);
break;
}
out_put:
put_device(old_parent);
out:
device_pm_unlock();
put_device(dev);
return error;
}
drivers/base/power/main.c
+44
View File
@@ -106,6 +106,50 @@ void device_pm_remove(struct device *dev)
mutex_unlock(&dpm_list_mtx);
}
/**
* device_pm_move_before - move device in dpm_list
* @deva: Device to move in dpm_list
* @devb: Device @deva should come before
*/
void device_pm_move_before(struct device *deva, struct device *devb)
{
pr_debug("PM: Moving %s:%s before %s:%s\n",
deva->bus ? deva->bus->name : "No Bus",
kobject_name(&deva->kobj),
devb->bus ? devb->bus->name : "No Bus",
kobject_name(&devb->kobj));
/* Delete deva from dpm_list and reinsert before devb. */
list_move_tail(&deva->power.entry, &devb->power.entry);
}
/**
* device_pm_move_after - move device in dpm_list
* @deva: Device to move in dpm_list
* @devb: Device @deva should come after
*/
void device_pm_move_after(struct device *deva, struct device *devb)
{
pr_debug("PM: Moving %s:%s after %s:%s\n",
deva->bus ? deva->bus->name : "No Bus",
kobject_name(&deva->kobj),
devb->bus ? devb->bus->name : "No Bus",
kobject_name(&devb->kobj));
/* Delete deva from dpm_list and reinsert after devb. */
list_move(&deva->power.entry, &devb->power.entry);
}
/**
* device_pm_move_last - move device to end of dpm_list
* @dev: Device to move in dpm_list
*/
void device_pm_move_last(struct device *dev)
{
pr_debug("PM: Moving %s:%s to end of list\n",
dev->bus ? dev->bus->name : "No Bus",
kobject_name(&dev->kobj));
list_move_tail(&dev->power.entry, &dpm_list);
}
/**
* pm_op - execute the PM operation appropiate for given PM event
* @dev: Device.
drivers/base/power/power.h
+8
View File
@@ -18,11 +18,19 @@ static inline struct device *to_device(struct list_head *entry)
extern void device_pm_add(struct device *);
extern void device_pm_remove(struct device *);
extern void device_pm_move_before(struct device *, struct device *);
extern void device_pm_move_after(struct device *, struct device *);
extern void device_pm_move_last(struct device *);
#else /* CONFIG_PM_SLEEP */
static inline void device_pm_add(struct device *dev) {}
static inline void device_pm_remove(struct device *dev) {}
static inline void device_pm_move_before(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_after(struct device *deva,
struct device *devb) {}
static inline void device_pm_move_last(struct device *dev) {}
#endif