Re: [PATCH v2 4/4] serial: imx: serialize imx_uart_ports[] lifetime

[Karl Mehltretter]

On Thu, Jul 30, 2026 at 02:02:05PM +0100, Frank Li wrote:
> imx_uart_remove()
> {
> 	imx_uart_ports[line] = NULL;
> 	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.

Thanks,
Karl