Re: [PATCH] serial: 8250: Add cpufreq support

[Alan Cox]

> As per my understanding, tty count keeps the count of tty_open and tty_release, that is
> how many open and close happened on the tty device file(/dev/ttyS*).
> The requirement here is a tty count check, if it is greater than zero then only it should
> proceed for further execution. 

The physical port has a different lifetime to the struct tty_struct
(which may change many times within the lifetime of the port). You can't
simply go from the port to a tty struct and assume this is safe and will
not change.

> Kindly elaborate more on the same if it's not correct.

Look at how tty_port_tty_get is used
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