iwlwifi: remove dead code iwl4965_calc_db_from_ratio

This patch removes iwl4965_calc_db_from_ratio which is dead code.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -1597,42 +1597,6 @@ void iwl_rx_handle(struct iwl_priv *priv)
 	priv->rxq.read = i;
 	iwl_rx_queue_restock(priv);
 }
-/* Convert linear signal-to-noise ratio into dB */
-static u8 ratio2dB[100] = {
-/*	 0   1   2   3   4   5   6   7   8   9 */
-	 0,  0,  6, 10, 12, 14, 16, 17, 18, 19, /* 00 - 09 */
-	20, 21, 22, 22, 23, 23, 24, 25, 26, 26, /* 10 - 19 */
-	26, 26, 26, 27, 27, 28, 28, 28, 29, 29, /* 20 - 29 */
-	29, 30, 30, 30, 31, 31, 31, 31, 32, 32, /* 30 - 39 */
-	32, 32, 32, 33, 33, 33, 33, 33, 34, 34, /* 40 - 49 */
-	34, 34, 34, 34, 35, 35, 35, 35, 35, 35, /* 50 - 59 */
-	36, 36, 36, 36, 36, 36, 36, 37, 37, 37, /* 60 - 69 */
-	37, 37, 37, 37, 37, 38, 38, 38, 38, 38, /* 70 - 79 */
-	38, 38, 38, 38, 38, 39, 39, 39, 39, 39, /* 80 - 89 */
-	39, 39, 39, 39, 39, 40, 40, 40, 40, 40  /* 90 - 99 */
-};
-
-/* Calculates a relative dB value from a ratio of linear
- *   (i.e. not dB) signal levels.
- * Conversion assumes that levels are voltages (20*log), not powers (10*log). */
-int iwl4965_calc_db_from_ratio(int sig_ratio)
-{
-	/* 1000:1 or higher just report as 60 dB */
-	if (sig_ratio >= 1000)
-		return 60;
-
-	/* 100:1 or higher, divide by 10 and use table,
-	 *   add 20 dB to make up for divide by 10 */
-	if (sig_ratio >= 100)
-		return (20 + (int)ratio2dB[sig_ratio/10]);
-
-	/* We shouldn't see this */
-	if (sig_ratio < 1)
-		return 0;
-
-	/* Use table for ratios 1:1 - 99:1 */
-	return (int)ratio2dB[sig_ratio];
-}
 
 #define PERFECT_RSSI (-20) /* dBm */
 #define WORST_RSSI (-95)   /* dBm */