Sunrpc: Supports hexadecimal number for sysctl files of sunrpc debug

The sunrpc debug sysctl files only accept decimal number right now.
But all the XXXDBUG_XXX macros are defined as hexadecimal.
It is not easy to set or check an separate flag.

This patch let those files support accepting hexadecimal number,
(decimal number is also supported). Also, display it as hexadecimal.

v2,
Remove duplicate parsing of '0x...', just using simple_strtol(tmpbuf, &s, 0)
Fix a bug of isspace() checking after parsing
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

net/sunrpc/sysctl.c

@@ -76,7 +76,7 @@ static int
 proc_dodebug(struct ctl_table *table, int write,
 				void __user *buffer, size_t *lenp, loff_t *ppos)
 {
-	char		tmpbuf[20], c, *s;
+	char		tmpbuf[20], c, *s = NULL;
 	char __user *p;
 	unsigned int	value;
 	size_t		left, len;
@@ -103,23 +103,24 @@ proc_dodebug(struct ctl_table *table, int write,
 			return -EFAULT;
 		tmpbuf[left] = '\0';
 
-		for (s = tmpbuf, value = 0; '0' <= *s && *s <= '9'; s++, left--)
-			value = 10 * value + (*s - '0');
-		if (*s && !isspace(*s))
-			return -EINVAL;
-		while (left && isspace(*s))
-			left--, s++;
+		value = simple_strtol(tmpbuf, &s, 0);
+		if (s) {
+			left -= (s - tmpbuf);
+			if (left && !isspace(*s))
+				return -EINVAL;
+			while (left && isspace(*s))
+				left--, s++;
+		} else
+			left = 0;
 		*(unsigned int *) table->data = value;
 		/* Display the RPC tasks on writing to rpc_debug */
 		if (strcmp(table->procname, "rpc_debug") == 0)
 			rpc_show_tasks(&init_net);
 	} else {
-		if (!access_ok(VERIFY_WRITE, buffer, left))
-			return -EFAULT;
-		len = sprintf(tmpbuf, "%d", *(unsigned int *) table->data);
+		len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data);
 		if (len > left)
 			len = left;
-		if (__copy_to_user(buffer, tmpbuf, len))
+		if (copy_to_user(buffer, tmpbuf, len))
 			return -EFAULT;
 		if ((left -= len) > 0) {
 			if (put_user('\n', (char __user *)buffer + len))