[PATCHv2] drivers: net: optimize hex2bin()

[Andy Shevchenko <andy.shevchenko@gmail.com>]

From: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>

Optimize hex2bin() function used in ps3_gelic_wireless.c. It requires to have
hex_to_bin() implementation introduced by starter patch [1] in series.

[1] http://patchwork.kernel.org/patch/81224/

Signed-off-by: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Cc: Geoff Levand <geoffrey.levand@am.sony.com>
---
 drivers/net/ps3_gelic_wireless.c |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ps3_gelic_wireless.c b/drivers/net/ps3_gelic_wireless.c
index 227b141..7c3d7f1 100644
--- a/drivers/net/ps3_gelic_wireless.c
+++ b/drivers/net/ps3_gelic_wireless.c
@@ -1394,23 +1394,20 @@ static int gelic_wl_get_mode(struct net_device *netdev,
 static int hex2bin(u8 *str, u8 *bin, unsigned int len)
 {
 	unsigned int i;
-	static unsigned char *hex = "0123456789ABCDEF";
-	unsigned char *p, *q;
-	u8 tmp;
 
 	if (len != WPA_PSK_LEN * 2)
 		return -EINVAL;
 
 	for (i = 0; i < WPA_PSK_LEN * 2; i += 2) {
-		p = strchr(hex, toupper(str[i]));
-		q = strchr(hex, toupper(str[i + 1]));
-		if (!p || !q) {
+		int h = hex_to_bin(str[i]);
+		int l = hex_to_bin(str[i+1]);
+
+		if ((h == -1) || (l == -1)) {
 			pr_info("%s: unconvertible PSK digit=%d\n",
 				__func__, i);
 			return -EINVAL;
 		}
-		tmp = ((p - hex) << 4) + (q - hex);
-		*bin++ = tmp;
+		*bin++ = (h << 4) + l;
 	}
 	return 0;
 };
-- 
1.5.6.5