Re: Regression from patch 'tty: hvc: hvc_poll() break hv read loop'

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

Thanks,
Nick