tty: USB hangup is racy
The USB layer uses tty_hangup to deal with unplugs of the physical hardware (analogous to loss of carrier) and then frees the resources. However the tty_hangup is asynchronous. As the hangup can sleep we can use tty_vhangup which is the non async version to avoid freeing resources too early. Signed-off-by: NAlan Cox <alan@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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