tree 3e23ffdcf11823bc13e5e525ce36639e170cab94
parent d199c96d41d80a567493e12b8e96ea056a1350c1
author Alan Stern <stern@rowland.harvard.edu> 1296673173 -0500
committer Greg Kroah-Hartman <gregkh@suse.de> 1296780408 -0800

USB: fix race between root-hub resume and wakeup requests

The USB core keeps track of pending resume requests for root hubs, in
order to resolve races between wakeup requests and suspends.  However
the code that does this is subject to another race (between wakeup
requests and resumes) because the WAKEUP_PENDING flag is cleared
before the resume occurs, leaving a window in which another wakeup
request might arrive.

This patch (as1447) fixes the problem by clearing the WAKEUP_PENDING
flag after the resume instead of before it.

This fixes Bugzilla #24952.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Paul Bender <pebender@san.rr.com>
Tested-by: warpme <warpme@o2.pl>
Cc: stable <stable@kernel.org> [.36+]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>