cifs: clean up various nits in unicode routines (try #2)

Minor revision to the original patch. Don't abuse the __le16 variable
on the stack by casting it to wchar_t and handing it off to char2uni.
Declare an actual wchar_t on the stack instead. This fixes a valid
sparse warning.

Fix the spelling of UNI_ASTERISK. Eliminate the unneeded len_remaining
variable in cifsConvertToUCS.

Also, as David Howells points out. We were better off making
cifsConvertToUCS *not* use put_unaligned_le16 since it means that we
can't optimize the mapped characters at compile time. Switch them
instead to use cpu_to_le16, and simply use put_unaligned to set them
in the string.

Reported-and-acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

2 files changed, 18 insertions, 19 deletions

diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index fc0fd4fde306..23d43cde4306 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -90,7 +90,7 @@ cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp,
         case UNI_COLON:
                 *target = ':';
                 break;
-        case UNI_ASTERIK:
+        case UNI_ASTERISK:
                 *target = '*';
                 break;
         case UNI_QUESTION:
@@ -264,40 +264,40 @@ cifs_strndup_from_ucs(const char *src, const int maxlen, const bool is_unicode,
  * names are little endian 16 bit Unicode on the wire
  */
 int
-cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
+cifsConvertToUCS(__le16 *target, const char *source, int srclen,
                  const struct nls_table *cp, int mapChars)
 {
         int i, j, charlen;
-        int len_remaining = maxlen;
         char src_char;
-        __u16 temp;
+        __le16 dst_char;
+        wchar_t tmp;
 
         if (!mapChars)
                 return cifs_strtoUCS(target, source, PATH_MAX, cp);
 
-        for (i = 0, j = 0; i < maxlen; j++) {
+        for (i = 0, j = 0; i < srclen; j++) {
                 src_char = source[i];
                 switch (src_char) {
                 case 0:
-                        put_unaligned_le16(0, &target[j]);
+                        put_unaligned(0, &target[j]);
                         goto ctoUCS_out;
                 case ':':
-                        temp = UNI_COLON;
+                        dst_char = cpu_to_le16(UNI_COLON);
                         break;
                 case '*':
-                        temp = UNI_ASTERIK;
+                        dst_char = cpu_to_le16(UNI_ASTERISK);
                         break;
                 case '?':
-                        temp = UNI_QUESTION;
+                        dst_char = cpu_to_le16(UNI_QUESTION);
                         break;
                 case '<':
-                        temp = UNI_LESSTHAN;
+                        dst_char = cpu_to_le16(UNI_LESSTHAN);
                         break;
                 case '>':
-                        temp = UNI_GRTRTHAN;
+                        dst_char = cpu_to_le16(UNI_GRTRTHAN);
                         break;
                 case '|':
-                        temp = UNI_PIPE;
+                        dst_char = cpu_to_le16(UNI_PIPE);
                         break;
                 /*
                  * FIXME: We can not handle remapping backslash (UNI_SLASH)
@@ -305,17 +305,17 @@ cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
                  * as they use backslash as separator.
                  */
                 default:
-                        charlen = cp->char2uni(source+i, len_remaining,
-                                                &temp);
+                        charlen = cp->char2uni(source + i, srclen - i, &tmp);
+                        dst_char = cpu_to_le16(tmp);
+
                         /*
                          * if no match, use question mark, which at least in
                          * some cases serves as wild card
                          */
                         if (charlen < 1) {
-                                temp = 0x003f;
+                                dst_char = cpu_to_le16(0x003f);
                                 charlen = 1;
                         }
-                        len_remaining -= charlen;
                         /*
                          * character may take more than one byte in the source
                          * string, but will take exactly two bytes in the
@@ -324,9 +324,8 @@ cifsConvertToUCS(__le16 *target, const char *source, int maxlen,
                         i += charlen;
                         continue;
                 }
-                put_unaligned_le16(temp, &target[j]);
+                put_unaligned(dst_char, &target[j]);
                 i++; /* move to next char in source string */
-                len_remaining--;
         }
 
 ctoUCS_out:
diff --git a/fs/cifs/cifs_unicode.h b/fs/cifs/cifs_unicode.h
index 7fe6b52df507..644dd882a560 100644
--- a/fs/cifs/cifs_unicode.h
+++ b/fs/cifs/cifs_unicode.h
@@ -44,7 +44,7 @@
  * reserved symbols (along with \ and /), otherwise illegal to store
  * in filenames in NTFS
  */
-#define UNI_ASTERIK     (__u16) ('*' + 0xF000)
+#define UNI_ASTERISK    (__u16) ('*' + 0xF000)
 #define UNI_QUESTION    (__u16) ('?' + 0xF000)
 #define UNI_COLON       (__u16) (':' + 0xF000)
 #define UNI_GRTRTHAN    (__u16) ('>' + 0xF000)