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Subject[PATCH 4.4 54/72] staging: comedi: ni_mio_common: ack ai fifo error interrupts.
Date
4.4-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
@@ -1348,6 +1348,8 @@ 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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