From 5be93bdda64e85450598c6e97f79fb8f6acf30e0 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Wed, 19 Feb 2014 12:00:51 +0100 Subject: [PATCH] can: flexcan: fix shutdown: first disable chip, then all interrupts When shutting down the CAN interface (ifconfig canX down) during high CAN bus loads, the CAN core might hang and freeze the whole CPU. This patch fixes the shutdown sequence by first disabling the CAN core then disabling all interrupts. Cc: linux-stable Signed-off-by: Marc Kleine-Budde --- drivers/net/can/flexcan.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 320bef2dba42..dcd69c9374ae 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -827,14 +827,16 @@ static void flexcan_chip_stop(struct net_device *dev) struct flexcan_regs __iomem *regs = priv->base; u32 reg; - /* Disable all interrupts */ - flexcan_write(0, ®s->imask1); - /* Disable + halt module */ reg = flexcan_read(®s->mcr); reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT; flexcan_write(reg, ®s->mcr); + /* Disable all interrupts */ + flexcan_write(0, ®s->imask1); + flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL, + ®s->ctrl); + if (priv->reg_xceiver) regulator_disable(priv->reg_xceiver); priv->can.state = CAN_STATE_STOPPED; -- 2.39.2