[PATCH 2/2] lib: call native hex_to_bin() inside _kstrtoull()

[Andy Shevchenko]

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
---
 lib/kstrtox.c |   15 ++++-----------
 1 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/lib/kstrtox.c b/lib/kstrtox.c
index 5099755..a26d287 100644
--- a/lib/kstrtox.c
+++ b/lib/kstrtox.c
@@ -39,25 +39,18 @@ static int _kstrtoull(const char *s, unsigned int base, unsigned long long *res)
 	acc = 0;
 	ok = 0;
 	while (*s) {
-		unsigned int val;
+		int val;
 
-		if ('0' <= *s && *s <= '9')
-			val = *s - '0';
-		else if ('a' <= TOLOWER(*s) && TOLOWER(*s) <= 'f')
-			val = TOLOWER(*s) - 'a' + 10;
-		else if (*s == '\n' && *(s + 1) == '\0')
+		if (unlikely(*s == '\n' && *(s + 1) == '\0'))
 			break;
-		else
-			return -EINVAL;
 
-		if (val >= base)
+		val = hex_to_bin(*s++);
+		if (val >= base || val < 0)
 			return -EINVAL;
 		if (acc > div_u64(ULLONG_MAX - val, base))
 			return -ERANGE;
 		acc = acc * base + val;
 		ok = 1;
-
-		s++;
 	}
 	if (!ok)
 		return -EINVAL;
-- 
1.7.5.4

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