Re: [PATCH v2] chardev/char-socket: Properly make qio connections non blocking

[Daniel P . Berrangé]

On Sun, Apr 19, 2020 at 03:21:40PM +0530, Sai Pavan Boddu wrote:
> In tcp_chr_sync_read function, there is a possibility of socket
> disconnection during blocking read, then tcp_chr_hup function would clean up
> the qio channel pointers(i.e ioc, sioc).
> 
> Signed-off-by: Sai Pavan Boddu <address@hidden>
> ---
> Changes for V2:
>       Place the guard around 'qio_channel_set_blocking' call to check 
> connection status
>       This fix is simpler than v1 and explains better about the issue.
> 
>  chardev/char-socket.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/chardev/char-socket.c b/chardev/char-socket.c
> index 185fe38..e56b2f0 100644
> --- a/chardev/char-socket.c
> +++ b/chardev/char-socket.c
> @@ -549,7 +549,9 @@ static int tcp_chr_sync_read(Chardev *chr, const uint8_t 
> *buf, int len)
>  
>      qio_channel_set_blocking(s->ioc, true, NULL);
>      size = tcp_chr_recv(chr, (void *) buf, len);
> -    qio_channel_set_blocking(s->ioc, false, NULL);
> +    if (s->state != TCP_CHARDEV_STATE_DISCONNECTED) {
> +        qio_channel_set_blocking(s->ioc, false, NULL);
> +    }
>      if (size == 0) {
>          /* connection closed */
>          tcp_chr_disconnect(chr);

Reviewed-by: Daniel P. Berrangé <address@hidden>


Regards,
Daniel
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