I reviewed and tested the new patch. For me it works fine.
Just one warning to fix:
fs/configfs/file.c: In function ‘fill_write_buffer’:
fs/configfs/file.c:184:6: warning: unused variable ‘to_copy’ [-Wunused-variable]
int to_copy, copied;
^~~~~~~
Apart from that you can add my tested-by or reviewed-by if you want.