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 [off-list ref] wrote:

quoted

On Wed, Sep 05, 2018 at 07:15:29AM +1000, Nicholas Piggin wrote:

quoted

On Tue, 4 Sep 2018 11:48:08 -0600
Jason Gunthorpe [off-list ref] wrote:

quoted

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 <redacted>

Thanks