From: Marc Kleine-Budde Date: Wed, 19 Feb 2014 11:00:51 +0000 (+0100) Subject: can: flexcan: fix shutdown: first disable chip, then all interrupts X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5be93bdda64e85450598c6e97f79fb8f6acf30e0;p=linux-beck.git 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 --- 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;