Re: [Qemu-devel] [PATCH 1/3] virtio-console: Check if chardev backends available before calling into them

[Anthony Liguori <anthony@codemonkey.ws>]

On 12/21/2011 12:58 AM, Amit Shah wrote:
> For the callback functions invoked by the virtio-serial-bus code, check
> if we have chardev backends registered before we call into the chardev
> functions.
>
> Signed-off-by: Amit Shah<amit.shah@redhat.com>

Applied all.  Thanks.

Regards,

Anthony Liguori

> ---
>   hw/virtio-console.c |   11 +++++++++++
>   1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/hw/virtio-console.c b/hw/virtio-console.c
> index d3351c8..dbbea76 100644
> --- a/hw/virtio-console.c
> +++ b/hw/virtio-console.c
> @@ -27,6 +27,11 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
>       VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
>       ssize_t ret;
>
> +    if (!vcon->chr) {
> +        /* If there's no backend, we can just say we consumed all data. */
> +        return len;
> +    }
> +
>       ret = qemu_chr_fe_write(vcon->chr, buf, len);
>       trace_virtio_console_flush_buf(port->id, len, ret);
>
> @@ -52,6 +57,9 @@ static void guest_open(VirtIOSerialPort *port)
>   {
>       VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
>
> +    if (!vcon->chr) {
> +        return;
> +    }
>       qemu_chr_fe_open(vcon->chr);
>   }
>
> @@ -60,6 +68,9 @@ static void guest_close(VirtIOSerialPort *port)
>   {
>       VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
>
> +    if (!vcon->chr) {
> +        return;
> +    }
>       qemu_chr_fe_close(vcon->chr);
>   }
>