drivers: isdn: remove custom strtoul()

In this case we safe to use strict_strtoul().

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Karsten Keil <isdn@linux-pingi.de>
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 28 deletions

diff --git a/drivers/isdn/hysdn/hysdn_proclog.c b/drivers/isdn/hysdn/hysdn_proclog.c
index 7003698e667d..2ee93d04b2dd 100644
--- a/drivers/isdn/hysdn/hysdn_proclog.c
+++ b/drivers/isdn/hysdn/hysdn_proclog.c
@@ -16,6 +16,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
+#include <linux/kernel.h>
 
 #include "hysdn_defs.h"
 
@@ -155,9 +156,8 @@ static ssize_t
 hysdn_log_write(struct file *file, const char __user *buf, size_t count, loff_t * off)
 {
         unsigned long u = 0;
-        int found = 0;
-        unsigned char *cp, valbuf[128];
-        long base = 10;
+        int rc;
+        unsigned char valbuf[128];
         hysdn_card *card = file->private_data;
 
         if (count > (sizeof(valbuf) - 1))
@@ -166,32 +166,10 @@ hysdn_log_write(struct file *file, const char __user *buf, size_t count, loff_t
                 return (-EFAULT);       /* copy failed */
 
         valbuf[count] = 0;      /* terminating 0 */
-        cp = valbuf;
-        if ((count > 2) && (valbuf[0] == '0') && (valbuf[1] == 'x')) {
-                cp += 2;        /* pointer after hex modifier */
-                base = 16;
-        }
-        /* scan the input for debug flags */
-        while (*cp) {
-                if ((*cp >= '0') && (*cp <= '9')) {
-                        found = 1;
-                        u *= base;      /* adjust to next digit */
-                        u += *cp++ - '0';
-                        continue;
-                }
-                if (base != 16)
-                        break;  /* end of number */
-
-                if ((*cp >= 'a') && (*cp <= 'f')) {
-                        found = 1;
-                        u *= base;      /* adjust to next digit */
-                        u += *cp++ - 'a' + 10;
-                        continue;
-                }
-                break;          /* terminated */
-        }
 
-        if (found) {
+        rc = strict_strtoul(valbuf, 0, &u);
+
+        if (rc == 0) {
                 card->debug_flags = u;  /* remember debug flags */
                 hysdn_addlog(card, "debug set to 0x%lx", card->debug_flags);
         }