On 11/13/2014 11:15 AM, Marc Kleine-Budde wrote: > On 11/13/2014 07:58 AM, Kedareswara rao Appana wrote: >> When accessing the priv structure use container_of instead of dev_get_drvdata. > > Why? The drvdata here is the struct net_device, not the platform device. Please state this in the commit message. If I understand the code correct, you can make use of the existing helper function to_platform_device(): http://lxr.free-electrons.com/source/include/linux/platform_device.h#L42 > >> Enable the clocks in the suspend before accessing the registers of the CAN. >> >> Signed-off-by: Kedareswara rao Appana <appanad@xxxxxxxxxx> >> --- >> drivers/net/can/xilinx_can.c | 20 ++++++++++++++++++-- >> 1 files changed, 18 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c >> index 5e8b560..63ef645 100644 >> --- a/drivers/net/can/xilinx_can.c >> +++ b/drivers/net/can/xilinx_can.c >> @@ -972,15 +972,30 @@ static const struct net_device_ops xcan_netdev_ops = { >> */ >> static int __maybe_unused xcan_suspend(struct device *dev) >> { >> - struct platform_device *pdev = dev_get_drvdata(dev); >> + struct platform_device *pdev = container_of(dev, >> + struct platform_device, dev); >> struct net_device *ndev = platform_get_drvdata(pdev); >> struct xcan_priv *priv = netdev_priv(ndev); >> + int ret; >> >> if (netif_running(ndev)) { >> netif_stop_queue(ndev); >> netif_device_detach(ndev); >> } >> >> + ret = clk_prepare_enable(priv->can_clk); >> + if (ret) { >> + dev_err(dev, "unable to enable device clock\n"); >> + return ret; >> + } >> + >> + ret = clk_prepare_enable(priv->bus_clk); >> + if (ret) { >> + dev_err(dev, "unable to enable bus clock\n"); >> + clk_disable_unprepare(priv->can_clk); >> + return ret; >> + } > > Now you have clock imbalance. Per suspend/resume cycle the clocks are > enabled twice, but disabled only once. > >> + >> priv->write_reg(priv, XCAN_MSR_OFFSET, XCAN_MSR_SLEEP_MASK); >> priv->can.state = CAN_STATE_SLEEPING; >> >> @@ -999,7 +1014,8 @@ static int __maybe_unused xcan_suspend(struct device *dev) >> */ >> static int __maybe_unused xcan_resume(struct device *dev) >> { >> - struct platform_device *pdev = dev_get_drvdata(dev); >> + struct platform_device *pdev = container_of(dev, >> + struct platform_device, dev); >> struct net_device *ndev = platform_get_drvdata(pdev); >> struct xcan_priv *priv = netdev_priv(ndev); >> int ret; Marc -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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