netdev - RE: [PATCH 5/7: rtlwifi: Fix smatch warning in pci.c

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Date:	Mon, 16 Sep 2013 10:26:28 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Larry Finger" <Larry.Finger@...inger.net>,
	<linville@...driver.com>
Cc:	<linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: RE: [PATCH 5/7: rtlwifi: Fix smatch warning in pci.c

> Smatch reports the following:
>   CHECK   drivers/net/wireless/rtlwifi/pci.c
> drivers/net/wireless/rtlwifi/pci.c:739 _rtl_pci_rx_interrupt() warn: assigning (-98) to unsigned
> variable 'stats.noise'
> 
> This problem is fixed by changing the value to 256 - 98.
> 
> Signed-off-by: Larry Finger <Larry.Finger@...inger.net>
> ---
>  drivers/net/wireless/rtlwifi/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/rtlwifi/pci.c b/drivers/net/wireless/rtlwifi/pci.c
> index 703f839..bf498f5 100644
> --- a/drivers/net/wireless/rtlwifi/pci.c
> +++ b/drivers/net/wireless/rtlwifi/pci.c
> @@ -736,7 +736,7 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
> 
>  	struct rtl_stats stats = {
>  		.signal = 0,
> -		.noise = -98,
> +		.noise = 158,	/* -98 dBm */
>  		.rate = 0,
>  	};
>  	int index = rtlpci->rx_ring[rx_queue_idx].idx;

That doesn't look nice at all.
Something like (unsigned int)-98 would be slightly better,
but it looks as though something is actually wrong with
the type of 'noise' itself.

	David



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