Re: 8250 serial console fixes -- issue

[Kumar Gala]

On Feb 2, 2006, at 2:05 AM, Kumar Gala wrote:

> On Feb 1, 2006, at 11:54 PM, Kumar Gala wrote:
>
> > On Feb 1, 2006, at 7:47 PM, Alan Cox wrote:
> >
> > > On Mer, 2006-02-01 at 19:21 -0600, Kumar Gala wrote:
> > > > This patch introduces an issue for me an embedded PowerPC SoC  
> > > > using the
> > > > 8250 driver.
> > > >
> > > > The simple description of my issue is this:  I'm using the  
> > > > serial port for
> > > > both a terminal and console.  I run fdisk on a /dev/hda.  Before  
> > > > this
> > > > patch I would get the prompt for fdisk immediately.  After this  
> > > > patch I
> > > > have to hit return before the prompt is displayed.
> > > >
> > > > I know that's not a lot of info, but just let me know what else  
> > > > you need
> > > > to help debug this.
> > > >
> > > > I'm guessing something about the UARTs on the PowerPC maybe bit  
> > > > a little
> > > > non-standard.
> > >
> > > I wonder if I've swapped one race for another. Can you revert  
> > > just the
> > > line which forces THRI on and test with the rest of the change  
> > > please.
> >
> > This doesn't seem to help.
>
> I realized a bit later that the kernel I build with your suggested  
> change wasn't the one I was testing.  After loading the proper  
> kernel this does make the issue I was seeing go away.

After some further testing with this change, the majority of issues I  
was seeing go away.  However, able to lock the console up. If I  
revert the wait_for_xmitr() to always use BOTH_EMPTY the lock up goes  
away.  (Obviously, this is effectively reverting the whole patch).

- kumar
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