Patch "can: hi311x: Use level-triggered interrupt" has been added to the 4.14-stable tree

[<gregkh@xxxxxxxxxxxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    can: hi311x: Use level-triggered interrupt

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     can-hi311x-use-level-triggered-interrupt.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From f164d0204b1156a7e0d8d1622c1a8d25752befec Mon Sep 17 00:00:00 2001
From: Lukas Wunner <lukas@xxxxxxxxx>
Date: Sat, 27 Oct 2018 10:36:54 +0200
Subject: can: hi311x: Use level-triggered interrupt

From: Lukas Wunner <lukas@xxxxxxxxx>

commit f164d0204b1156a7e0d8d1622c1a8d25752befec upstream.

If the hi3110 shares the SPI bus with another traffic-intensive device
and packets are received in high volume (by a separate machine sending
with "cangen -g 0 -i -x"), reception stops after a few minutes and the
counter in /proc/interrupts stops incrementing.  Bus state is "active".
Bringing the interface down and back up reconvenes the reception.  The
issue is not observed when the hi3110 is the sole device on the SPI bus.

Using a level-triggered interrupt makes the issue go away and lets the
hi3110 successfully receive 2 GByte over the course of 5 days while a
ks8851 Ethernet chip on the same SPI bus handles 6 GByte of traffic.

Unfortunately the hi3110 datasheet is mum on the trigger type.  The pin
description on page 3 only specifies the polarity (active high):
http://www.holtic.com/documents/371-hi-3110_v-rev-kpdf.do

Cc: Mathias Duckeck <m.duckeck@xxxxxxxxx>
Cc: Akshay Bhat <akshay.bhat@xxxxxxxxxxx>
Cc: Casey Fitzpatrick <casey.fitzpatrick@xxxxxxxxxxx>
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Cc: linux-stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 Documentation/devicetree/bindings/net/can/holt_hi311x.txt |    2 +-
 drivers/net/can/spi/hi311x.c                              |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

--- a/Documentation/devicetree/bindings/net/can/holt_hi311x.txt
+++ b/Documentation/devicetree/bindings/net/can/holt_hi311x.txt
@@ -18,7 +18,7 @@ Example:
 		reg = <1>;
 		clocks = <&clk32m>;
 		interrupt-parent = <&gpio4>;
-		interrupts = <13 IRQ_TYPE_EDGE_RISING>;
+		interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
 		vdd-supply = <&reg5v0>;
 		xceiver-supply = <&reg5v0>;
 	};
--- a/drivers/net/can/spi/hi311x.c
+++ b/drivers/net/can/spi/hi311x.c
@@ -760,7 +760,7 @@ static int hi3110_open(struct net_device
 {
 	struct hi3110_priv *priv = netdev_priv(net);
 	struct spi_device *spi = priv->spi;
-	unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_RISING;
+	unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_HIGH;
 	int ret;
 
 	ret = open_candev(net);


Patches currently in stable-queue which might be from lukas@xxxxxxxxx are

queue-4.14/can-hi311x-use-level-triggered-interrupt.patch