[PATCH] target: use native hex2bin()

[Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>]

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: "Nicholas A. Bellinger" <nab@xxxxxxxxxxxxxxx>
---
 drivers/target/iscsi/iscsi_target_auth.c |   37 +++++-------------------------
 1 files changed, 6 insertions(+), 31 deletions(-)

diff --git a/drivers/target/iscsi/iscsi_target_auth.c b/drivers/target/iscsi/iscsi_target_auth.c
index 11fd743..f3c6899 100644
--- a/drivers/target/iscsi/iscsi_target_auth.c
+++ b/drivers/target/iscsi/iscsi_target_auth.c
@@ -18,6 +18,7 @@
  * GNU General Public License for more details.
  ******************************************************************************/
 
+#include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/crypto.h>
 #include <linux/err.h>
@@ -27,40 +28,14 @@
 #include "iscsi_target_nego.h"
 #include "iscsi_target_auth.h"
 
-static unsigned char chap_asciihex_to_binaryhex(unsigned char val[2])
-{
-	unsigned char result = 0;
-	/*
-	 * MSB
-	 */
-	if ((val[0] >= 'a') && (val[0] <= 'f'))
-		result = ((val[0] - 'a' + 10) & 0xf) << 4;
-	else
-		if ((val[0] >= 'A') && (val[0] <= 'F'))
-			result = ((val[0] - 'A' + 10) & 0xf) << 4;
-		else /* digit */
-			result = ((val[0] - '0') & 0xf) << 4;
-	/*
-	 * LSB
-	 */
-	if ((val[1] >= 'a') && (val[1] <= 'f'))
-		result |= ((val[1] - 'a' + 10) & 0xf);
-	else
-		if ((val[1] >= 'A') && (val[1] <= 'F'))
-			result |= ((val[1] - 'A' + 10) & 0xf);
-		else /* digit */
-			result |= ((val[1] - '0') & 0xf);
-
-	return result;
-}
-
 static int chap_string_to_hex(unsigned char *dst, unsigned char *src, int len)
 {
-	int i, j = 0;
+	int j = DIV_ROUND_UP(len, 2);
+	int rc;
 
-	for (i = 0; i < len; i += 2) {
-		dst[j++] = (unsigned char) chap_asciihex_to_binaryhex(&src[i]);
-	}
+	rc = hex2bin(dst, src, lenght);
+	if (rc < 0)
+		pr_debug("CHAP string contains non hex digit symbols\n");
 
 	dst[j] = '\0';
 	return j;
-- 
1.7.6.3

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