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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
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44
drivers/base/power/main.c
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@@ -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.