Problem with ACM driver and open()

[Marcel Holtmann <marcel@xxxxxxxxxxxx>]

Hi Oliver,

so we have a problem with ACM driver in 2.6.31 and open() while a
previous kernel is working fine.

static int open_device(const char *device)
{
	struct termios ti;
	int fd;

	fd = open(device, O_RDWR | O_NOCTTY);
	if (fd < 0)
		return -1;

	tcflush(fd, TCIOFLUSH);

	/* Switch TTY to raw mode */
	memset(&ti, 0, sizeof(ti));
	cfmakeraw(&ti);

	tcsetattr(fd, TCSANOW, &ti);

	return fd;
}

So when calling open() like this on ttyACM0 we get an EIO error. Adding
O_NONBLOCK to the flags, it would work.

Did we change something here that makes open() fail if we use blocking
open call? Is a blocking open() not meant to be working on a ttyACM0
anymore?

Regards

Marcel


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