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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-05-30 15:39:33 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-12 16:34:30 -0700 |
| commit | b41a60eca833d76593d4dac8a59f5c38714194ee (patch) | |
| tree | a7c5cf721d9978503c3c8c88183747cf954b8733 /drivers/usb/core/Kconfig | |
| parent | 54515fe528d8c6f9bfaf7d0b9fffb908deecad78 (diff) | |
| download | blackbird-op-linux-b41a60eca833d76593d4dac8a59f5c38714194ee.tar.gz blackbird-op-linux-b41a60eca833d76593d4dac8a59f5c38714194ee.zip | |
USB: add power/persist device attribute
This patch (as920) adds an extra level of protection to the
USB-Persist facility. Now it will apply by default only to hubs; for
all other devices the user must enable it explicitly by setting the
power/persist device attribute.
The disconnect_all_children() routine in hub.c has been removed and
its code placed inline. This is the way it was originally as part of
hub_pre_reset(); the revised usage in hub_reset_resume() is
sufficiently different that the code can no longer be shared.
Likewise, mark_children_for_reset() is now inline as part of
hub_reset_resume(). The end result looks much cleaner than before.
The sysfs interface is updated to add the new attribute file, and
there are corresponding documentation updates.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/Kconfig')
| -rw-r--r-- | drivers/usb/core/Kconfig | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/usb/core/Kconfig b/drivers/usb/core/Kconfig index 5113ef4cb7f6..97b09f282705 100644 --- a/drivers/usb/core/Kconfig +++ b/drivers/usb/core/Kconfig @@ -91,12 +91,15 @@ config USB_PERSIST depends on USB && PM && EXPERIMENTAL default n help - If you say Y here, USB device data structures will remain + + If you say Y here and enable the "power/persist" attribute + for a USB device, the device's data structures will remain persistent across system suspend, even if the USB bus loses - power. (This includes software-suspend, also known as swsusp, - or suspend-to-disk.) The devices will reappear as if by magic - when the system wakes up, with no need to unmount USB filesystems, - rmmod host-controller drivers, or do anything else. + power. (This includes hibernation, also known as swsusp or + suspend-to-disk.) The devices will reappear as if by magic + when the system wakes up, with no need to unmount USB + filesystems, rmmod host-controller drivers, or do anything + else. WARNING: This option can be dangerous! |
