[PATCH] USB: EHCI SMP fix
This addresses an SMP-only issue with the EHCI driver, where only one CPU should scan the schedule at a time (scanning is not re-entrant) but either the IRQ handler or a watchdog timer could end up starting it. Many thanks to Olaf Hering for isolating the failure mode, and testing this fix! Once once CPU starts scanning, any other might as well finish right away. This fix just adds a flag to detect that case. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
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