diff options
| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2014-02-19 11:00:51 (GMT) |
|---|---|---|
| committer | Marc Kleine-Budde <mkl@pengutronix.de> | 2014-03-03 11:40:52 (GMT) |
| commit | 5be93bdda64e85450598c6e97f79fb8f6acf30e0 (patch) | |
| tree | ec4522c10a34495e6cc8f13e1ef1f62de89d1ce9 /drivers/net/can | |
| parent | 635d61a3735e05c8da72740006670f819e5b6a5f (diff) | |
| download | linux-5be93bdda64e85450598c6e97f79fb8f6acf30e0.tar.xz | |
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 <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Diffstat (limited to 'drivers/net/can')
| -rw-r--r-- | drivers/net/can/flexcan.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 320bef2..dcd69c9 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; |