now the problem.. The file descriptors passed are invalid, the values are correct but when the kernel module code tries to convert the file descriptor to a file pointer,it fails.

struct file* fdtofp(int fd)
{
  struct file* fp;
  fp = current->files->fd[fd];
  if (fp->f_inode == NULL)
  {
     return NULL; // fp->f_inode turns out to be null and the
                  // function returns here
  }
}  

This code works perfectly on the x86 linux but not on the arm version.The descriptors are created successfully using the pipe function.

can anyone explain what could be going wrong?How can i debug? Is there a way to convert a file descriptor to a struct file* in a user process?

thanks for any help,
Pradeep Gore