Re: [PATCH 1/1] dccp ccid-3: replace incorrect BUG_ON

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Acked-by: Ian McDonald <ian.mcdonald@xxxxxxxxxxx>

On 27 February 2012 02:05, Gerrit Renker <gerrit@xxxxxxxxxxxxxx> wrote:
> dccp ccid-3: replace incorrect BUG_ON
>
> This replaces an unjustified BUG_ON(), which could get triggered under normal
> conditions: X_calc can be 0 when p > 0. X would in this case be set to the
> minimum, s/t_mbi. Its replacement avoids t_ipi = 0 (unbounded sending rate).
>
> Thanks to Jordi, Victor and Xavier who reported this.
>
> Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
> ---
>  net/dccp/ccids/ccid3.c |    3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> --- a/net/dccp/ccids/ccid3.c
> +++ b/net/dccp/ccids/ccid3.c
> @@ -98,6 +98,7 @@ static void ccid3_update_send_interval(s
>  {
>        hc->tx_t_ipi = scaled_div32(((u64)hc->tx_s) << 6, hc->tx_x);
>
> +       DCCP_BUG_ON(hc->tx_t_ipi == 0);
>        ccid3_pr_debug("t_ipi=%u, s=%u, X=%u\n", hc->tx_t_ipi,
>                       hc->tx_s, (unsigned)(hc->tx_x >> 6));
>  }
> @@ -236,8 +237,6 @@ static void ccid3_hc_tx_no_feedback_time
>                 *
>                 *  Note that X_recv is scaled by 2^6 while X_calc is not
>                 */
> -               BUG_ON(hc->tx_p && !hc->tx_x_calc);
> -
>                if (hc->tx_x_calc > (hc->tx_x_recv >> 5))
>                        hc->tx_x_recv =
>                                max(hc->tx_x_recv / 2,
> --
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