On 12/29/2015 07:31 AM, Joe Perches wrote:
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;
}
X is not thermometer. The thermometer is {-1, 0, 1, 2}. X is {0, 1, 2}.
All possible X valueswritten in the comments:
ar9003_hw_get_thermometer used only in ar9003_hw_thermometer_apply:
static void ar9003_hw_thermometer_apply(struct ath_hw *ah)
{
struct ath9k_hw_capabilities *pCap = &ah->caps;
int thermometer = ar9003_hw_get_thermometer(ah);
u8 therm_on = (thermometer < 0) ? 0 : 1;
REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_RXTX4,
AR_PHY_65NM_CH0_RXTX4_THERM_ON_OVR, therm_on);
if (pCap->chip_chainmask & BIT(1))
REG_RMW_FIELD(ah, AR_PHY_65NM_CH1_RXTX4,
AR_PHY_65NM_CH0_RXTX4_THERM_ON_OVR, therm_on);
if (pCap->chip_chainmask & BIT(2))
REG_RMW_FIELD(ah, AR_PHY_65NM_CH2_RXTX4,
AR_PHY_65NM_CH0_RXTX4_THERM_ON_OVR, therm_on);
therm_on = (thermometer < 0) ? 0 : (thermometer == 0); /* X = 0 */
REG_RMW_FIELD(ah, AR_PHY_65NM_CH0_RXTX4,
AR_PHY_65NM_CH0_RXTX4_THERM_ON, therm_on);
if (pCap->chip_chainmask & BIT(1)) {
therm_on = (thermometer < 0) ? 0 : (thermometer == 1);
/* X = 1 */
REG_RMW_FIELD(ah, AR_PHY_65NM_CH1_RXTX4,
AR_PHY_65NM_CH0_RXTX4_THERM_ON, therm_on);
}
if (pCap->chip_chainmask & BIT(2)) {
therm_on = (thermometer < 0) ? 0 : (thermometer == 2);
/* X = 2 */
REG_RMW_FIELD(ah, AR_PHY_65NM_CH2_RXTX4,
AR_PHY_65NM_CH0_RXTX4_THERM_ON, therm_on);
}
}
There is no X = -1.
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