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Re: [PATCH 1/2] zd1211rw: Experimental change to add proper monitor support

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On Mon, Feb 15, 2010 at 12:34 AM, Benoit Papillault
<benoit.papillault@xxxxxxx> wrote:
> Without this patch, monitor mode does not returns all frames. With this patch,
> the performance are quite poor if we create a monitor interface. Note :
> creating a monitor interface with the "cook" flag has no impact on performance.
>
> Signed-off-by: Benoit Papillault <benoit.papillault@xxxxxxx>
> ---
>  drivers/net/wireless/zd1211rw/zd_mac.c |   20 +++++++++++++++++++-
>  1 files changed, 19 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
> index 2d555cc..9cb6cbc 100644
> --- a/drivers/net/wireless/zd1211rw/zd_mac.c
> +++ b/drivers/net/wireless/zd1211rw/zd_mac.c
> @@ -904,8 +904,26 @@ static int zd_op_config(struct ieee80211_hw *hw, u32 changed)
>  {
>        struct zd_mac *mac = zd_hw_mac(hw);
>        struct ieee80211_conf *conf = &hw->conf;
> +       int ret;
>
> -       return zd_chip_set_channel(&mac->chip, conf->channel->hw_value);
> +       if (changed & IEEE80211_CONF_CHANGE_MONITOR) {
> +               /*
> +                * Warning : enabling this register kills RX & TX
> +                * performance
> +                */
> +               u32 cr_sniffer = !!(conf->flags & IEEE80211_CONF_MONITOR);
> +               ret = zd_iowrite32(&mac->chip, CR_SNIFFER_ON, cr_sniffer);
> +               if (!ret)
> +                       return ret;

Your logic is the wrong way around. You should return if nonzero, not if zero.

> +       }
> +
> +       if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
> +               ret = zd_chip_set_channel(&mac->chip, conf->channel->hw_value);
> +               if (!ret)
> +                       return ret;
> +       }
> +
> +       return 0;
>  }
>
>  static void zd_process_intr(struct work_struct *work)
> --
> 1.5.6.5
>
> --
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