Re: Serial: bug in 8250.c when handling PCI or other level triggers

[Russell King]

On Mon, Jan 09, 2006 at 12:24:52AM +0100, Antonio Vargas wrote:
> On 12/29/05, Meelis Roos <mroos@xxxxxxxx> wrote:
> > > Can I assume that the bug has disappeared?  Does the patch make it
> > > disappear?
> >
> > Yes, seems so.
> >
> > --
> > Meelis Roos (mroos@xxxxxxxx)
> 
> Please notice official linus 2.6.15 tree doesn't have this fix... I've
> just installed a virtual machine (qemu-system-i386 with linus 2.6.15 +
> plain debian 3r0, console output to xterm via emulated serial console)
> and trying to use any curses program (top for example) produces
> exactly this type of error.

That's because the patch just adds debugging seems to be sufficient to
cause the bug to disappear.  It isn't a fix.

The only explaination I have at the moment is that it changes the timing
- maybe there's a bug in these UARTs... I don't know at the moment.
What I do know is that Alan's original premise seems wrong.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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