linux-kernel - [PATCH] Replace faulty is_hex

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Date:	Thu, 31 Jul 2014 05:35:55 +0530
From:	Arjun Sreedharan <arjun024@...il.com>
To:	rjw@...ysocki.net
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, joe@...ches.com
Subject: [PATCH] Replace faulty is_hex_digit() by isxdigit()

0 is ascii for NULL. Hex digit matching should be from '0'.
Unfixed version returns true for #,$,%,& etc.

Signed-off-by: Arjun Sreedharan <arjun024@...il.com>
---
 drivers/acpi/acpi_pnp.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/acpi/acpi_pnp.c b/drivers/acpi/acpi_pnp.c
index 4ddb0dc..6d5922d 100644
--- a/drivers/acpi/acpi_pnp.c
+++ b/drivers/acpi/acpi_pnp.c
@@ -320,11 +320,6 @@ static const struct acpi_device_id acpi_pnp_device_ids[] = {
 	{""},
 };
 
-static bool is_hex_digit(char c)
-{
-	return (c >= 0 && c <= '9') || (c >= 'A' && c <= 'F');
-}
-
 static bool matching_id(char *idstr, char *list_id)
 {
 	int i;
@@ -335,7 +330,7 @@ static bool matching_id(char *idstr, char *list_id)
 	for (i = 3; i < 7; i++) {
 		char c = toupper(idstr[i]);
 
-		if (!is_hex_digit(c)
+		if (!isxdigit(c)
 		    || (list_id[i] != 'X' && c != toupper(list_id[i])))
 			return false;
 	}
-- 
1.7.11.7

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