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USB: skip autosuspended devices during system resume

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System suspends and hibernation are supposed to be as transparent as
possible.  By this reasoning, if a USB device is already autosuspended
before the system sleep begins then it should remain autosuspended
after the system wakes up.

This patch (as1001) adds a skip_sys_resume flag to the usb_device
structure and uses it to avoid waking up devices which were suspended
when a system sleep began.

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 2007-10-10 16:30:12 -04:00 • committed by Greg Kroah-Hartman
commit 271f9e68f3
2 changed files with 21 additions and 7 deletions
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include/linux/usb.h
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@ -430,6 +430,7 @@ struct usb_device {
unsigned persist_enabled:1; /* USB_PERSIST enabled for this dev */
unsigned autosuspend_disabled:1; /* autosuspend and autoresume */
unsigned autoresume_disabled:1; /* disabled by the user */
unsigned skip_sys_resume:1; /* skip the next system resume */
#endif
};
#define to_usb_device(d) container_of(d, struct usb_device, dev)