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> > uart_remove_one_port(&imx_uart_uart_driver, &sport->port); > > } > > > > Is above sequence to avoid use mutex? > > > > I now tried this, but it doesn't work as-is: > > uart_add_one_port() may call imx_uart_console_setup(), so the entry > must be present before the call. > > uart_remove_one_port() unregisters the console. Clearing the entry first > causes its callbacks to dereference NULL. > > The mutex protects those sequences against sibling probes. Okay Frank > > Thanks, > Karl