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58aca23226
Modify the PM core to protect its data structures, specifically the dpm_active list, from being corrupted if a child of the currently suspending device is registered concurrently with its ->suspend() callback. In that case, since the new device (the child) is added to dpm_active after its parent, the PM core will attempt to suspend it after the parent, which is wrong. Introduce a new member of struct dev_pm_info, called 'sleeping', and use it to check if the parent of the device being added to dpm_active has been suspended, in which case the device registration fails. Also, use 'sleeping' for checking if the ordering of devices on dpm_active is correct. Introduce variable 'all_sleeping' that will be set to 'true' once all devices have been suspended and make new device registrations fail until 'all_sleeping' is reset to 'false', in order to avoid having unsuspended devices around while the system is going into a sleep state. Remove pm_sleep_rwsem which is not necessary any more. Special thanks to Alan Stern for discussions and suggestions that lead to the creation of this patch. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
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| .. | ||
| 00-INDEX | ||
| basic-pm-debugging.txt | ||
| devices.txt | ||
| drivers-testing.txt | ||
| freezing-of-tasks.txt | ||
| interface.txt | ||
| notifiers.txt | ||
| pci.txt | ||
| pm_qos_interface.txt | ||
| pm.txt | ||
| power_supply_class.txt | ||
| s2ram.txt | ||
| states.txt | ||
| swsusp-and-swap-files.txt | ||
| swsusp-dmcrypt.txt | ||
| swsusp.txt | ||
| tricks.txt | ||
| userland-swsusp.txt | ||
| video_extension.txt | ||
| video.txt | ||