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[efi] Inhibit our driver Start() method during disconnection attempts
Some HP BIOSes (observed with a Z840) seem to attempt to connect our drivers in the middle of our call to DisconnectController(). The precise chain of events is unclear, but the symptom is that we see several calls to our Supported() and Start() methods, followed by a system lock-up. Work around this dubious BIOS behaviour by explicitly failing calls to our Start() method while we are in the middle of attempting to disconnect drivers. Reported-by: Jordan Wright <email@example.com> Debugged-by: Adrian Lucrèce Céleste <firstname.lastname@example.org> Debugged-by: Christian Nilsson <email@example.com> Tested-by: Jordan Wright <firstname.lastname@example.org> Signed-off-by: Michael Brown <email@example.com>
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