serial: 8250: RX hang issue

[Pradeep Kumar]

Hi All,
I am working on a mobile development platform and performing some stress
warm boot tests using UART debug console(which is using serial 8250 driver
for console).

I am getting device debug console UART RX hang after iterations > 1500.
after this issue am not* able to issue any command. Able to see logs
though.

Later I kept some debug prints in isr and able to see that device is able
to generate interrupts when some data is received. So I came to conclusion
that some malfunctioning is happening  in upper layer not sure which layer
has this problem. Can some one give some ideas at which layer I can check?

One more observation is when I perform a open and close calls on debug UART
port(in my case ttyS0) while device is in UART RX hang state, then I notice
the UART console RX again below active and able issue commands from UART
console itself.
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