Messages in this thread | | | Date | Tue, 15 Jul 2014 15:54:26 +0200 | From | Lothar Waßmann <> | Subject | Re: [PATCH v3 3/4] can: flexcan: switch on clocks before accessing ecr register |
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Hi,
Stefan Agner wrote: > Reported-by: Ashutosh Singh <ashuleapyear@gmail.com> > Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de> > [stefan@agner.ch: added return check for clk_enable_prepare] > > Signed-off-by: Stefan Agner <stefan@agner.ch> > --- > drivers/net/can/flexcan.c | 18 ++++++++++++++++-- > 1 file changed, 16 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c > index f425ec2..89745aa 100644 > --- a/drivers/net/can/flexcan.c > +++ b/drivers/net/can/flexcan.c > @@ -383,12 +383,26 @@ static int flexcan_get_berr_counter(const struct net_device *dev, > { > const struct flexcan_priv *priv = netdev_priv(dev); > struct flexcan_regs __iomem *regs = priv->base; > - u32 reg = flexcan_read(®s->ecr); > + u32 reg, 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; > + > + reg = flexcan_read(®s->ecr); > flexcan_get_berr_counter() may be called from interrupt context and thus must not call any functions that can sleep. Compiling the driver with CONFIG_DEBUG_ATOMIC_SLEEP would catch this!
Lothar Waßmann -- ___________________________________________________________
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