linux-kernel - Re: Regression from patch 'tty: hvc: hvc

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Date:   Tue, 4 Sep 2018 15:16:35 -0600
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Leon Romanovsky <leonro@...lanox.com>
Subject: Re: Regression from patch 'tty: hvc: hvc_poll() break hv read loop'

On Wed, Sep 05, 2018 at 07:15:29AM +1000, Nicholas Piggin wrote:
> On Tue, 4 Sep 2018 11:48:08 -0600
> Jason Gunthorpe <jgg@...lanox.com> wrote:
> 
> > Hi Nicholas,
> > 
> > I am testing 4.19-rc2 and I see bad behavior with my qemu hvc0
> > console..
> > 
> > Running interactive with qemu (qemu-2.11.2-1.fc28) on the console
> > providing hvc0, using options like:
> > 
> >         -nographic
> >         -chardev stdio,id=stdio,mux=on,signal=off
> >         -mon chardev=stdio
> > 	-device isa-serial,chardev=stdio
> >         -device virtio-serial-pci
> > 	-device virtconsole,chardev=stdio
> > 
> > I see the hvc0 console hang regularly, ie doing something like 'up
> > arrow' in bash causes the hvc0 console to hang. Prior kernels worked
> > OK.
> > 
> > Any ideas? I'm not familiar with this code.. Thanks!
> 
> Yes I have had another report, I'm working on a fix. Sorry it has taken
> a while and thank you for the report.

Okay, let me know when you have a fix and I will be able to test it
for you!

Thanks,
Jason