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: Alan Cox <alan@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -219,8 +219,11 @@ int tty_port_block_til_ready(struct tty_port *port,
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/* if non-blocking mode is set we can pass directly to open unless
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the port has just hung up or is in another error state */
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if ((filp->f_flags & O_NONBLOCK) ||
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(tty->flags & (1 << TTY_IO_ERROR))) {
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if (tty->flags & (1 << TTY_IO_ERROR)) {
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port->flags |= ASYNC_NORMAL_ACTIVE;
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return 0;
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}
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if (filp->f_flags & O_NONBLOCK) {
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/* Indicate we are open */
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if (tty->termios->c_cflag & CBAUD)
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tty_port_raise_dtr_rts(port);
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