msi: Avoid redundant loading of media info.

dlls/msi/media.c

@@ -658,16 +658,16 @@ static UINT get_drive_type(const WCHAR *path)
 
 UINT msi_load_media_info(MSIPACKAGE *package, UINT Sequence, MSIMEDIAINFO *mi)
 {
+    static const WCHAR query[] = {
+        'S','E','L','E','C','T',' ','*',' ','F','R','O','M',' ','`','M','e','d','i','a','`',' ',
+        'W','H','E','R','E',' ','`','L','a','s','t','S','e','q','u','e','n','c','e','`',' ',
+        '>','=',' ','%','i',' ','O','R','D','E','R',' ','B','Y',' ','`','D','i','s','k','I','d','`',0};
     MSIRECORD *row;
-    LPWSTR source_dir;
-    LPWSTR source;
+    LPWSTR source_dir, source;
     DWORD options;
 
-    static const WCHAR query[] = {
-        'S','E','L','E','C','T',' ','*',' ', 'F','R','O','M',' ',
-        '`','M','e','d','i','a','`',' ','W','H','E','R','E',' ',
-        '`','L','a','s','t','S','e','q','u','e','n','c','e','`',' ','>','=',' ','%','i',
-        ' ','O','R','D','E','R',' ','B','Y',' ','`','D','i','s','k','I','d','`',0};
+    if (Sequence <= mi->last_sequence) /* already loaded */
+        return ERROR_SUCCESS;
 
     row = MSI_QueryGetRecord(package->db, query, Sequence);
     if (!row)
@@ -720,6 +720,7 @@ UINT msi_load_media_info(MSIPACKAGE *package, UINT Sequence, MSIMEDIAINFO *mi)
                          options, INSTALLPROPERTY_LASTUSEDSOURCEW, source);
 
     msi_free(source_dir);
+    TRACE("sequence %u -> cabinet %s disk id %u\n", Sequence, debugstr_w(mi->cabinet), mi->disk_id);
     return ERROR_SUCCESS;
 }