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

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commit 8627b96dd80dca440d91fbb1ec733be25912d0dd upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox
2009-11-18 14:12:58 +00:00
committed by Greg Kroah-Hartman
parent 77d12b19a0
commit d9abf6e4f6
1 changed files with 5 additions and 2 deletions
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7
drivers/char/tty_port.c
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@@ -217,8 +217,11 @@ 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);