Re: [Xen-devel] [PATCH] pvgrub: ignore NUL

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Nov 06, 2014 at 03:43:42PM +0000, Stefano Stabellini wrote:
> On Thu, 6 Nov 2014, Samuel Thibault wrote:
> > Stefano Stabellini, le Thu 06 Nov 2014 10:41:28 +0000, a écrit :
> > > When using pvgrub in graphical mode with vnc, the grub timeout doesn't
> > > work: the countdown doesn't even start. With a serial terminal the
> > > problem doesn't occur and the countdown works as expected.
> > > 
> > > It turns out that the problem is that when using a graphical terminal,
> > > checkkey () returns 0 instead of -1 when there is no activity on the
> > > mouse or keyboard. As a consequence grub thinks that the user typed
> > > something and interrupts the count down.
> > > 
> > > To fix the issue simply ignore keystrokes returning 0, that is the NUL
> > > character anyway. Add a patch to grub.patches to do that.
> > > 
> > > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> > > Tested-by: Steven Haigh <netwiz@xxxxxxxxx>
> > 
> > Acked-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
> 
> This being a bug fix, I guess it doesn't actually need a release
> exception to go in?

It should - but it depends on the on how risk averse the maintainer
of the particular subsystem is.

Regardless I believe this should go in. But more importantly - can
this also go upstream?
> 
> 
> > > diff --git a/stubdom/grub.patches/11graphics-keyboard.diff 
> > > b/stubdom/grub.patches/11graphics-keyboard.diff
> > > new file mode 100644
> > > index 0000000..fe17b20
> > > --- /dev/null
> > > +++ b/stubdom/grub.patches/11graphics-keyboard.diff
> > > @@ -0,0 +1,13 @@
> > > +diff --git a/stage2/stage2.c b/stage2/stage2.c
> > > +index 9d9fcc3..8353a3b 100644
> > > +--- a/stage2/stage2.c
> > > ++++ b/stage2/stage2.c
> > > +@@ -395,7 +395,7 @@ restart:
> > > +          pressed.  
> > > +          This avoids polling (relevant in the grub-shell and later on
> > > +          in grub if interrupt driven I/O is done).  */
> > > +-      if (checkkey () >= 0 || grub_timeout < 0)
> > > ++      if (checkkey () > 0 || grub_timeout < 0)
> > > +         {
> > > +           /* Key was pressed, show which entry is selected before 
> > > GETKEY,
> > > +              since we're comming in here also on GRUB_TIMEOUT == -1 and
> > > 
> > 
> > -- 
> > Samuel
> > "And the next time you consider complaining that running Lucid Emacs
> > 19.05 via NFS from a remote Linux machine in Paraguay doesn't seem to
> > get the background colors right, you'll know who to thank."
> > (By Matt Welsh)
> > 


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