linux-kernel - Re: [PATCH] can: Fix bug in suspend/resume

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Date:	Thu, 13 Nov 2014 12:32:18 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Appana Durga Kedareswara Rao <appana.durga.rao@...inx.com>
Cc:	Marc Kleine-Budde <mkl@...gutronix.de>,
	"wg@...ndegger.com" <wg@...ndegger.com>,
	Michal Simek <michals@...inx.com>,
	Soren Brinkmann <sorenb@...inx.com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Subject: Re: [PATCH] can: Fix bug in suspend/resume

Hi,

Appana Durga Kedareswara Rao wrote:
> Hi Marc,
> 
> -----Original Message-----
> From: Marc Kleine-Budde [mailto:mkl@...gutronix.de]
> Sent: Thursday, November 13, 2014 4:16 PM
> To: Appana Durga Kedareswara Rao; wg@...ndegger.com; Michal Simek; Soren Brinkmann; grant.likely@...aro.org; robh+dt@...nel.org
> Cc: linux-can@...r.kernel.org; netdev@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org; devicetree@...r.kernel.org; Appana Durga Kedareswara Rao
> Subject: Re: [PATCH] can: Fix bug in suspend/resume
> 
> 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
> 
> Thanks for the suggestion.
>  Will use this macro(to_platform_device)  .
> 
> >
> >> Enable the clocks in the suspend before accessing the registers of the CAN.
> >>
> >> Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
> >> ---
> >>  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);
>
Why not simply:
	struct net_device *ndev = dev_get_drvdata(dev);

There is no need for a struct platform_device* at all.


Lothar Waßmann
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