iob->ki_cancel field is mostly NULL). However, sys_io_cancel system call universally sets return code to -EAGAIN. This gives applications a wrong impression that this call is implemented but just never works. We have customer inquires about this issue. Changed by Benjamin LaHaise to EINVAL instead of ENOSYS Signed-off-by: S. Wendy Cheng Acked-by: Benjamin LaHaise Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds ‘á4