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    Subject[PATCH 3.4 065/134] USB: mos7840: fix broken TIOCMIWAIT
    Date
    3.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Johan Hovold <jhovold@gmail.com>

    commit e670c6af12517d08a403487b1122eecf506021cf upstream.

    Make sure waiting processes are woken on modem-status changes.

    Currently processes are only woken on termios changes regardless of
    whether the modem status has changed.

    Signed-off-by: Johan Hovold <jhovold@gmail.com>
    [bwh: Backported to 3.2: adjust context]
    Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
    Cc: Yang Yingliang <yangyingliang@huawei.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/serial/mos7840.c | 5 +++--
    1 file changed, 3 insertions(+), 2 deletions(-)

    --- a/drivers/usb/serial/mos7840.c
    +++ b/drivers/usb/serial/mos7840.c
    @@ -453,6 +453,9 @@ static void mos7840_handle_new_msr(struc
    icount->rng++;
    smp_wmb();
    }
    +
    + mos7840_port->delta_msr_cond = 1;
    + wake_up_interruptible(&mos7840_port->delta_msr_wait);
    }
    }

    @@ -2074,8 +2077,6 @@ static void mos7840_change_port_settings
    mos7840_port->read_urb_busy = false;
    }
    }
    - wake_up(&mos7840_port->delta_msr_wait);
    - mos7840_port->delta_msr_cond = 1;
    dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
    mos7840_port->shadowLCR);
    }



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