Linux 3.15: SPARC serial console regression

[Aaro Koskinen]

Hi,

While testing the final 3.15, I noticed the serial console (sunsab)
does not work anymore on Sun Ultra.

It will tx fine the console output during the boot. But then I try
to type something e.g. at the login: prompt, it behaves oddly:
it re-transmits some old output, and then stalls for a few secs, usually
for each character. Typed characters are however received correctly.
But the console is impossible to use...

I bisected this to:

717f3bbab3c7628736ef738fdbf3d9a28578c26c is the first bad commit
commit 717f3bbab3c7628736ef738fdbf3d9a28578c26c
Author: Seth Bollinger <sethb@xxxxxxxx>
Date:   Tue Mar 25 12:55:37 2014 -0500

    serial_core: Fix conditional start_tx on ring buffer not empty

A.
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