linux-kernel - Re: [PATCH] /drivers/net/wireless/ath/ath9k remove unnecessary ?: operator

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Date:	Mon, 28 Dec 2015 16:31:24 -0800
From:	Joe Perches <joe@...ches.com>
To:	Ivan Safonov <insafonov@...il.com>,
	QCA ath9k Development <ath9k-devel@....qualcomm.com>
Cc:	Kalle Valo <kvalo@...eaurora.org>, linux-wireless@...r.kernel.org,
	ath9k-devel@...ts.ath9k.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] /drivers/net/wireless/ath/ath9k remove unnecessary ?:
 operator

On Tue, 2015-12-29 at 01:38 +0700, Ivan Safonov wrote:
> On 12/29/2015 12:56 AM, Joe Perches wrote:
> > On Mon, 2015-12-28 at 20:48 +0700, Ivan Safonov wrote:
> > > ((thermometer < 0) ? 0 : (thermometer == X)) and (thermometer ==
> > > X) are equal for X >= 0.
> > X is not guaranteed to be >= 0 here
> 
> X is fixed constant. In this case X is {0, 1, 2}.

Looks like it can be -1 to me (range: -1, 0, 1, 2)

static int ar9003_hw_get_thermometer(struct ath_hw *ah)
{
	struct ar9300_eeprom *eep = &ah->eeprom.ar9300_eep;
	struct ar9300_base_eep_hdr *pBase = &eep->baseEepHeader;
	int thermometer =  (pBase->miscConfiguration >> 1) & 0x3;

	return --thermometer;
}

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