return same error value from spk_set_key_info

This patch makes spk_set_key_info return -EINVAL
in case of failure instead of returning 4 different
values for the type of error that occurred.

Print the offending values instead as debug message.

Signed-off-by: Pranay Kr. Srivastava <pranjas@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/speakup/main.c

@@ -1226,13 +1226,19 @@ int spk_set_key_info(const u_char *key_info, u_char *k_buffer)
 	u_char ch, version, num_keys;
 
 	version = *cp++;
-	if (version != KEY_MAP_VER)
-		return -1;
+	if (version != KEY_MAP_VER) {
+		pr_debug("version found %d should be %d\n",
+			 version, KEY_MAP_VER);
+		return -EINVAL;
+	}
 	num_keys = *cp;
 	states = (int)cp[1];
 	key_data_len = (states + 1) * (num_keys + 1);
-	if (key_data_len + SHIFT_TBL_SIZE + 4 >= sizeof(spk_key_buf))
-		return -2;
+	if (key_data_len + SHIFT_TBL_SIZE + 4 >= sizeof(spk_key_buf)) {
+		pr_debug("too many key_infos (%d over %u)\n",
+			 key_data_len + SHIFT_TBL_SIZE + 4, (unsigned int)(sizeof(spk_key_buf)));
+		return -EINVAL;
+	}
 	memset(k_buffer, 0, SHIFT_TBL_SIZE);
 	memset(spk_our_keys, 0, sizeof(spk_our_keys));
 	spk_shift_table = k_buffer;
@@ -1243,14 +1249,19 @@ int spk_set_key_info(const u_char *key_info, u_char *k_buffer)
 	cp1 += 2;		/* now pointing at shift states */
 	for (i = 1; i <= states; i++) {
 		ch = *cp1++;
-		if (ch >= SHIFT_TBL_SIZE)
-			return -3;
+		if (ch >= SHIFT_TBL_SIZE) {
+			pr_debug("(%d) not valid shift state (max_allowed = %d)\n", ch,
+				 SHIFT_TBL_SIZE);
+			return -EINVAL;
+		}
 		spk_shift_table[ch] = i;
 	}
 	keymap_flags = *cp1++;
 	while ((ch = *cp1)) {
-		if (ch >= MAX_KEY)
-			return -4;
+		if (ch >= MAX_KEY) {
+			pr_debug("(%d), not valid key, (max_allowed = %d)\n", ch, MAX_KEY);
+			return -EINVAL;
+		}
 		spk_our_keys[ch] = cp1;
 		cp1 += states + 1;
 	}