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USB: add USB-Persist facility

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This patch (as886) adds the controversial USB-persist facility,
allowing USB devices to persist across a power loss during system
suspend.

The facility is controlled by a new Kconfig option (with appropriate
warnings about the potential dangers); when the option is off the
behavior will remain the same as it is now.  But when the option is
on, people will be able to use suspend-to-disk and keep their USB
filesystems intact -- something particularly valuable for small
machines where the root filesystem is on a USB device!

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2007-05-04 11:52:20 -04:00
committed by Greg Kroah-Hartman
parent ce7cd137fc
commit 0458d5b4c9
10 changed files with 353 additions and 79 deletions
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8
include/linux/usb.h
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@ -403,6 +403,7 @@ struct usb_device {
unsigned auto_pm:1; /* autosuspend/resume in progress */
unsigned do_remote_wakeup:1; /* remote wakeup should be enabled */
unsigned reset_resume:1; /* needs reset instead of resume */
unsigned autosuspend_disabled:1; /* autosuspend and autoresume */
unsigned autoresume_disabled:1; /* disabled by the user */
#endif
@ -819,7 +820,10 @@ struct usbdrv_wrap {
* @pre_reset: Called by usb_reset_composite_device() when the device
* is about to be reset.
* @post_reset: Called by usb_reset_composite_device() after the device
* has been reset.
* has been reset, or in lieu of @resume following a reset-resume
* (i.e., the device is reset instead of being resumed, as might
* happen if power was lost). The second argument tells which is
* the reason.
* @id_table: USB drivers use ID table to support hotplugging.
* Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
* or your driver's probe function will never get called.
@ -861,7 +865,7 @@ struct usb_driver {
int (*resume) (struct usb_interface *intf);
void (*pre_reset) (struct usb_interface *intf);
void (*post_reset) (struct usb_interface *intf);
void (*post_reset) (struct usb_interface *intf, int reset_resume);
const struct usb_device_id *id_table;