old_num_blocks = BITMAP_INDEX ( bitmap->length + BITMAP_BLKSIZE - 1 );
new_num_blocks = BITMAP_INDEX ( new_length + BITMAP_BLKSIZE - 1 );
- new_size = ( new_num_blocks * sizeof ( bitmap->blocks[0] ) );
- new_blocks = realloc ( bitmap->blocks, new_size );
- if ( ! new_blocks ) {
- DBGC ( bitmap, "Bitmap %p could not resize to %d bits\n",
- bitmap, new_length );
- return -ENOMEM;
+ if ( old_num_blocks != new_num_blocks ) {
+ new_size = ( new_num_blocks * sizeof ( bitmap->blocks[0] ) );
+ new_blocks = realloc ( bitmap->blocks, new_size );
+ if ( ! new_blocks ) {
+ DBGC ( bitmap, "Bitmap %p could not resize to %d "
+ "bits\n", bitmap, new_length );
+ return -ENOMEM;
+ }
+ bitmap->blocks = new_blocks;
}
- bitmap->blocks = new_blocks;
bitmap->length = new_length;
while ( old_num_blocks < new_num_blocks ) {