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

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Date:   Wed, 5 Sep 2018 07:42:21 +0300
From:   Leon Romanovsky <leonro@...lanox.com>
To:     Nicholas Piggin <npiggin@...il.com>
Cc:     Jason Gunthorpe <jgg@...lanox.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: Regression from patch 'tty: hvc: hvc_poll() break hv read loop'

On Wed, Sep 05, 2018 at 01:51:56PM +1000, Nicholas Piggin wrote:
> On Tue, 4 Sep 2018 15:16:35 -0600
> Jason Gunthorpe <jgg@...lanox.com> wrote:
>
> > 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!
>
> Can you try this?

It worked for me, so it will work for Jason too (we have same setup).

Tested-by: Leon Romanovsky <leonro@...lanox.com>

Thanks