From: Frank Mori Hess <fmh6jj@gmail.com>
Date: Thu, 15 Mar 2018 10:25:44 +0000 (+0000)
Subject: staging: comedi: ni_mio_common: ack ai fifo error interrupts.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a59779368b33874df5857603e8863801296c3a7f;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

staging: comedi: ni_mio_common: ack ai fifo error interrupts.

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>
---

diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
index 398347fedc47..2cac160993bb 100644
--- 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 comedi_device *dev, unsigned short a_status)
 		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);
 }