Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 8627b96d authored by Alan Cox's avatar Alan Cox Committed by Greg Kroah-Hartman
Browse files

tty_port: handle the nonblocking open of a dead port corner case 



Some drivers allow O_NDELAY of a dead port (eg for setserial to work). In that
situation we must not try to raise the carrier.

Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Cc: stable <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent a8a84540

drivers/char/tty_port.c

+5 −2
Original line number Diff line number Diff line
@@ -219,8 +219,11 @@ int tty_port_block_til_ready(struct tty_port *port, 


	/* if non-blocking mode is set we can pass directly to open unless

	   the port has just hung up or is in another error state */

	if ((filp->f_flags & O_NONBLOCK) ||

			(tty->flags & (1 << TTY_IO_ERROR))) {

	if (tty->flags & (1 << TTY_IO_ERROR)) {

		port->flags |= ASYNC_NORMAL_ACTIVE;

		return 0;

	}

	if (filp->f_flags & O_NONBLOCK) {

		/* Indicate we are open */

		if (tty->termios->c_cflag & CBAUD)

			tty_port_raise_dtr_rts(port);