diff options
| author | Alan Cox <alan@linux.intel.com> | 2009-11-18 14:12:58 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-11-30 16:38:25 -0800 |
| commit | 8627b96dd80dca440d91fbb1ec733be25912d0dd (patch) | |
| tree | b0b534e46c6d8ba93a8183de4abfc1cdd0323a38 /drivers | |
| parent | a8a84540eb3fd0493f250dc1c513bef6810a50fd (diff) | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/tty_port.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c index 2e8552dc5eda..c63f3d33914a 100644 --- a/drivers/char/tty_port.c +++ b/drivers/char/tty_port.c @@ -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); |