USB: fix spinlock recursion in cdc-acm.c
this fixes the spinlock recursion issue. The older fix was incomplete. Signed-off-by: Oliver Neukum <oneukum@suse.de> Acked-by: Pete Zaitcev <zaitcev@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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