[PATCH v3 4/4] can: flexcan: add vf610 support for FlexCAN
From: mkl@pengutronix.de (Marc Kleine-Budde)
Date: 2014-07-28 16:31:28
Also in:
linux-can, lkml
Subsystem:
can network drivers, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Linus Torvalds
On 07/28/2014 06:20 PM, Stefan Agner wrote: [...]
However, I got once this Kernel panic after I reconfigured to normal mode. But I could not reproduce this. [ 461.954394] flexcan_irq, esr=00059d82 [ 461.958093] flexcan_irq, ctrl=17092051 [ 461.961873] ------------[ cut here ]------------ [ 461.966536] WARNING: CPU: 0 PID: 0 at kernel/locking/mutex.c:826 mutex_trylock+0x1b0/0x208() [ 461.974982] DEBUG_LOCKS_WARN_ON(in_interrupt())
Please use this updated version of your patch: Marc ---
From b6b8ae7cdb04f1a3b9d3a6dd83f8146bfaf48553 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch> Date: Tue, 15 Jul 2014 14:56:20 +0200 Subject: [PATCH] can: flexcan: flexcan_get_berr_counter(): switch on clocks before accessing ecr register The funcion flexcan_get_berr_counter() may be called from userspace even if the interface is down, this the clocks are disabled. This patch switches on the clocks before accessing the ecr register. Reported-by: Ashutosh Singh <redacted> Signed-off-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- drivers/net/can/flexcan.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index f425ec2..6bfe24a 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c@@ -378,8 +378,9 @@ static int flexcan_chip_softreset(struct flexcan_priv *priv) return 0; } -static int flexcan_get_berr_counter(const struct net_device *dev, - struct can_berr_counter *bec) + +static int __flexcan_get_berr_counter(const struct net_device *dev, + struct can_berr_counter *bec) { const struct flexcan_priv *priv = netdev_priv(dev); struct flexcan_regs __iomem *regs = priv->base;
@@ -391,6 +392,29 @@ static int flexcan_get_berr_counter(const struct net_device *dev, return 0; } +static int flexcan_get_berr_counter(const struct net_device *dev, + struct can_berr_counter *bec) +{ + const struct flexcan_priv *priv = netdev_priv(dev); + int err; + + err = clk_prepare_enable(priv->clk_ipg); + if (err) + return err; + + err = clk_prepare_enable(priv->clk_per); + if (err) + goto out_disable_ipg; + + err = __flexcan_get_berr_counter(dev, bec); + + clk_disable_unprepare(priv->clk_per); + out_disable_ipg: + clk_disable_unprepare(priv->clk_ipg); + + return err; +} + static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev) { const struct flexcan_priv *priv = netdev_priv(dev);
@@ -503,7 +527,7 @@ static void do_state(struct net_device *dev, struct flexcan_priv *priv = netdev_priv(dev); struct can_berr_counter bec; - flexcan_get_berr_counter(dev, &bec); + __flexcan_get_berr_counter(dev, &bec); switch (priv->can.state) { case CAN_STATE_ERROR_ACTIVE:
--
2.0.1
--
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