USB: fix oops on disconnect in cdc-acm
This patch fixes an oops caused when during an unplug a device's table of endpoints is zeroed before the driver is notified. A pointer to the endpoint must be cached. this fixes a regression caused by commit 5186ffee Therefore it should go into 2.6.31 Signed-off-by: NOliver Neukum <oliver@neukum.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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