linux-kernel - [PATCH 4.9 085/102] staging: comedi: ni_mio

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Date:   Fri,  6 Apr 2018 15:24:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Frank Mori Hess <fmh6jj@...il.com>,
        Ian Abbott <abbotti@....co.uk>
Subject: [PATCH 4.9 085/102] staging: comedi: ni_mio_common: ack ai fifo error interrupts.

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Frank Mori Hess <fmh6jj@...il.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@...r.kernel.org> # v4.2+
Signed-off-by: Frank Mori Hess <fmh6jj@...il.com>
Signed-off-by: Ian Abbott <abbotti@....co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);
 }