The uartlite driver suffers from missing/duplicate/corrupted character
data when the interrupt handler runs concurrently with access to the
device from another cpu. Take the port spinlock to exclude concurrent
access.
Signed-off-by: NRich Felker <dalias@libc.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>