firewire: core: fw_csr_string addendum

Witespace and comment changes, and a different way to say i + 1 < end.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 16 insertions, 10 deletions

diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index a39e4344cd58..5d5c6a689837 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -69,19 +69,22 @@ static u32 *search_leaf(u32 *directory, int search_key)
                 if (last_key == search_key &&
                     key == (CSR_DESCRIPTOR | CSR_LEAF))
                         return ci.p - 1 + value;
+
                 last_key = key;
         }
+
         return NULL;
 }
 
 static int textual_leaf_to_string(u32 *block, char *buf, size_t size)
 {
-        unsigned int quadlets, length;
+        unsigned int quadlets, i;
+        char c;
 
         if (!size || !buf)
                 return -EINVAL;
 
-        quadlets = min(block[0] >> 16, 256u);
+        quadlets = min(block[0] >> 16, 256U);
         if (quadlets < 2)
                 return -ENODATA;
 
@@ -91,31 +94,34 @@ static int textual_leaf_to_string(u32 *block, char *buf, size_t size)
 
         block += 3;
         quadlets -= 2;
-        for (length = 0; length < quadlets * 4 && length + 1 < size; length++) {
-                char c = block[length / 4] >> (24 - 8 * (length % 4));
+        for (i = 0; i < quadlets * 4 && i < size - 1; i++) {
+                c = block[i / 4] >> (24 - 8 * (i % 4));
                 if (c == '\0')
                         break;
-                buf[length] = c;
+                buf[i] = c;
         }
-        buf[length] = '\0';
-        return length;
+        buf[i] = '\0';
+
+        return i;
 }
 
 /**
  * fw_csr_string - reads a string from the configuration ROM
- * @directory: device or unit directory;
- *             fw_device->config_rom+5 or fw_unit->directory
+ * @directory: e.g. root directory or unit directory
  * @key: the key of the preceding directory entry
  * @buf: where to put the string
  * @size: size of @buf, in bytes
  *
- * Returns string length (>= 0) or error code (< 0).
+ * The string is taken from a minimal ASCII text descriptor leaf after
+ * the immediate entry with @key.  The string is zero-terminated.
+ * Returns strlen(buf) or a negative error code.
  */
 int fw_csr_string(u32 *directory, int key, char *buf, size_t size)
 {
         u32 *leaf = search_leaf(directory, key);
         if (!leaf)
                 return -ENOENT;
+
         return textual_leaf_to_string(leaf, buf, size);
 }
 EXPORT_SYMBOL(fw_csr_string);