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    Subject[PATCH 4.15 60/72] staging: comedi: ni_mio_common: ack ai fifo error interrupts.
    Date
    4.15-stable review patch.  If anyone has any objections, please let me know.

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

    From: Frank Mori Hess <fmh6jj@gmail.com>

    commit e1d9fc04c41840a4688ef6ce90b6dcca157ea4d7 upstream.

    Ack ai fifo error interrupts in interrupt handler to clear interrupt
    after fifo overflow. It should prevent lock-ups after the ai fifo
    overflows.

    Cc: <stable@vger.kernel.org> # v4.2+
    Signed-off-by: Frank Mori Hess <fmh6jj@gmail.com>
    Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/staging/comedi/drivers/ni_mio_common.c | 2 ++
    1 file changed, 2 insertions(+)

    --- a/drivers/staging/comedi/drivers/ni_mio_common.c
    +++ b/drivers/staging/comedi/drivers/ni_mio_common.c
    @@ -1284,6 +1284,8 @@ static void ack_a_interrupt(struct comed
    ack |= NISTC_INTA_ACK_AI_START;
    if (a_status & NISTC_AI_STATUS1_STOP)
    ack |= NISTC_INTA_ACK_AI_STOP;
    + if (a_status & NISTC_AI_STATUS1_OVER)
    + ack |= NISTC_INTA_ACK_AI_ERR;
    if (ack)
    ni_stc_writew(dev, ack, NISTC_INTA_ACK_REG);
    }

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