linux-kernel - Re: [PATCH] iwmc3200wifi: Fix test of unsigned in iwm_ntf_stop_resume

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Date:	Thu, 17 Dec 2009 09:20:51 +0800
From:	Zhu Yi <yi.zhu@...el.com>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	Pavel Roskin <proski@....org>,
	"Ortiz, Samuel" <samuel.ortiz@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iwmc3200wifi: Fix test of unsigned in
 iwm_ntf_stop_resume_tx()

On Thu, 2009-12-17 at 00:01 +0800, Roel Kluin wrote:
> `queue' was unsigned so the test did not work.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> Found using coccinelle: http://coccinelle.lip6.fr/
> 
> >> -			if (queue < 0)
> >> +			if (queue == -EINVAL)
> > 
> > I think it's ugly.  iwm_tid_to_queue() should return int if it's allowed
> > to return error codes.
> 
> Ok, how about:
> 
>  drivers/net/wireless/iwmc3200wifi/iwm.h    |    2 +-
>  drivers/net/wireless/iwmc3200wifi/netdev.c |    2 +-
>  drivers/net/wireless/iwmc3200wifi/rx.c     |    2 +-
>  3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/iwmc3200wifi/iwm.h b/drivers/net/wireless/iwmc3200wifi/iwm.h
> index 5a26bb0..79ffa3b 100644
> --- a/drivers/net/wireless/iwmc3200wifi/iwm.h
> +++ b/drivers/net/wireless/iwmc3200wifi/iwm.h
> @@ -349,7 +349,7 @@ int iwm_up(struct iwm_priv *iwm);
>  int iwm_down(struct iwm_priv *iwm);
>  
>  /* TX API */
> -u16 iwm_tid_to_queue(u16 tid);
> +int iwm_tid_to_queue(u16 tid);
>  void iwm_tx_credit_inc(struct iwm_priv *iwm, int id, int total_freed_pages);
>  void iwm_tx_worker(struct work_struct *work);
>  int iwm_xmit_frame(struct sk_buff *skb, struct net_device *netdev);
> diff --git a/drivers/net/wireless/iwmc3200wifi/netdev.c b/drivers/net/wireless/iwmc3200wifi/netdev.c
> index e4f0f87..c4c0d23 100644
> --- a/drivers/net/wireless/iwmc3200wifi/netdev.c
> +++ b/drivers/net/wireless/iwmc3200wifi/netdev.c
> @@ -76,7 +76,7 @@ static int iwm_stop(struct net_device *ndev)
>   */
>  static const u16 iwm_1d_to_queue[8] = { 1, 0, 0, 1, 2, 2, 3, 3 };
>  
> -u16 iwm_tid_to_queue(u16 tid)
> +int iwm_tid_to_queue(u16 tid)
>  {
>  	if (tid > IWM_UMAC_TID_NR - 2)
>  		return -EINVAL;
> diff --git a/drivers/net/wireless/iwmc3200wifi/rx.c b/drivers/net/wireless/iwmc3200wifi/rx.c
> index 1c57c1f..6d6ed74 100644
> --- a/drivers/net/wireless/iwmc3200wifi/rx.c
> +++ b/drivers/net/wireless/iwmc3200wifi/rx.c
> @@ -1126,7 +1126,7 @@ static int iwm_ntf_stop_resume_tx(struct iwm_priv *iwm, u8 *buf,
>  
>  		if (!stop) {
>  			struct iwm_tx_queue *txq;
> -			u16 queue = iwm_tid_to_queue(bit);
> +			int queue = iwm_tid_to_queue(bit);
>  
>  			if (queue < 0)
>  				continue;

Good catch. Thanks both for the fix.

Acked-by: Zhu Yi <yi.zhu@...el.com>

Thanks,
-yi

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