Hi Jaap,
> WIth Btattach, ioctl fails to set flags from 32-bit user space to 64-bit
> kernel. ioctl fails with ENOTTY.
>
> static int attach_proto(const char *path, unsigned int proto,
> unsigned int flags)
> {
> int fd, dev_id;
>
> fd = open_serial(path);
> if (fd < 0)
> return -1;
>
> if (ioctl(fd, HCIUARTSETFLAGS, flags) < 0) {
> perror("Failed to set flags");
> close(fd);
> return -1;
> }
> .....
I am a little bit lost on how you get ENOTTY. The only way I can see this happening if the kernel falls through towards n_tty_ioctl_helper and that means that cmd is messed up.
If you go into drivers/bluetooth/hci_ldisc.c and add this line
hci_uart_ldisc.compat_ioctl = hci_uart_tty_ioctl;
it might fix it. It is a guess right now until you figure out where the ENOTTY is coming from.
Regards
Marcel
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