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[Qemu-devel] Re: [PATCH 5/7] virtio-serial: Don't clear ->have_data() po
From: |
Amit Shah |
Subject: |
[Qemu-devel] Re: [PATCH 5/7] virtio-serial: Don't clear ->have_data() pointer after unplug |
Date: |
Wed, 23 Mar 2011 19:09:51 +0530 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On (Wed) 23 Mar 2011 [14:33:25], Juan Quintela wrote:
> Amit Shah <address@hidden> wrote:
> > After a port unplug operation, the port->info->have_data() pointer was
> > set to NULL. The problem is, the ->info struct is shared by all ports,
> > effectively disabling writes to other ports.
> >
> > Reported-by: juzhang <address@hidden>
> > Signed-off-by: Amit Shah <address@hidden>
> > ---
> > hw/virtio-console.c | 1 -
> > 1 files changed, 0 insertions(+), 1 deletions(-)
> >
> > diff --git a/hw/virtio-console.c b/hw/virtio-console.c
> > index 4440784..be59558 100644
> > --- a/hw/virtio-console.c
> > +++ b/hw/virtio-console.c
> > @@ -82,7 +82,6 @@ static int virtconsole_exitfn(VirtIOSerialPort *port)
> > VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
> >
> > if (vcon->chr) {
> > - port->info->have_data = NULL;
> > qemu_chr_close(vcon->chr);
> > }
>
> Discussed with Amit over irc, I think that we are missing setup of
> have_data for non console devices, but that is a different bug that the
> one being fixed here.
Actually other virtio_serial devices will provide their own have_data,
like spice did earlier (now it's a chardev, so it uses this code
path).
I think the bug is that we should set have_data regardless of a chardev
backend and call qemu_chr_write() in have_data only if a chardev
exists.
Amit
- [Qemu-devel] [PULL #7 0/7] virtio-serial fixes, enhancements, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 1/7] virtio-serial: Use a struct to pass config information from proxy, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 2/7] virtio-serial: Disallow generic ports at id 0, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 3/7] virtio-serial: Enable ioeventfd, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 4/7] virtio-serial-bus: Simplify handle_output() function, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 5/7] virtio-serial: Don't clear ->have_data() pointer after unplug, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 6/7] virtio-console: Keep chardev open for other users after hot-unplug, Amit Shah, 2011/03/21
- [Qemu-devel] [PATCH 7/7] char: Prevent multiple devices opening same chardev, Amit Shah, 2011/03/21
- [Qemu-devel] Re: [PULL #7 0/7] virtio-serial fixes, enhancements, Juan Quintela, 2011/03/23