linux-kernel - Re: [PATCH 5/5] iwlegacy: add missing null check

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Message-ID: <20110603030746.GA4834@joana>
Date:	Fri, 3 Jun 2011 00:07:46 -0300
From:	"Gustavo F. Padovan" <padovan@...fusion.mobi>
To:	Greg Dietsche <Gregory.Dietsche@....edu>
Cc:	sgruszka@...hat.com, linville@...driver.com,
	kernel-janitors@...r.kernel.org, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] iwlegacy: add missing null check

Hi Greg,

* Greg Dietsche <Gregory.Dietsche@....edu> [2011-06-02 21:06:10 -0500]:

> lq_sta has other null checks in this funcion.
> assuming they are correct, this additional null check
> should be added too.
> 
> Signed-off-by: Greg Dietsche <Gregory.Dietsche@....edu>
> ---
>  drivers/net/wireless/iwlegacy/iwl-4965-rs.c |   66 ++++++++++++++-------------
>  1 files changed, 34 insertions(+), 32 deletions(-)
> 
> diff --git a/drivers/net/wireless/iwlegacy/iwl-4965-rs.c b/drivers/net/wireless/iwlegacy/iwl-4965-rs.c
> index 24d1499..a475aac 100644
> --- a/drivers/net/wireless/iwlegacy/iwl-4965-rs.c
> +++ b/drivers/net/wireless/iwlegacy/iwl-4965-rs.c
> @@ -2275,40 +2275,42 @@ iwl4965_rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
>  	if (rate_control_send_low(sta, priv_sta, txrc))
>  		return;
>  
> -	rate_idx  = lq_sta->last_txrate_idx;
> -
> -	if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
> -		rate_idx -= IWL_FIRST_OFDM_RATE;
> -		/* 6M and 9M shared same MCS index */
> -		rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
> -		if (iwl4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
> -			 IWL_RATE_MIMO2_6M_PLCP)
> -			rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
> -		info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
> -		if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
> -			info->control.rates[0].flags |=
> -					IEEE80211_TX_RC_SHORT_GI;
> -		if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
> -			info->control.rates[0].flags |=
> -					IEEE80211_TX_RC_DUP_DATA;
> -		if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
> -			info->control.rates[0].flags |=
> -					IEEE80211_TX_RC_40_MHZ_WIDTH;
> -		if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
> -			info->control.rates[0].flags |=
> -					IEEE80211_TX_RC_GREEN_FIELD;
> -	} else {
> -		/* Check for invalid rates */
> -		if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
> -				((sband->band == IEEE80211_BAND_5GHZ) &&
> -				 (rate_idx < IWL_FIRST_OFDM_RATE)))
> -			rate_idx = rate_lowest_index(sband, sta);
> -		/* On valid 5 GHz rate, adjust index */
> -		else if (sband->band == IEEE80211_BAND_5GHZ)
> +	if (lq_sta) {

Then do
	if (!lq_sta)
		return;

to avoid an exatra level of indentation.

-- 
Gustavo F. Padovan
http://profusion.mobi
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