netdev - Re: [PATCH net-next-2.6 v4 1/1] can: c_can: Added support for Bosch C

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Date:	Wed, 12 Jan 2011 10:08:37 +0100
From:	Wolfgang Grandegger <wg@...ndegger.com>
To:	Bhupesh SHARMA <bhupesh.sharma@...com>
CC:	Marc Kleine-Budde <mkl@...gutronix.de>,
	"Socketcan-core@...ts.berlios.de" <Socketcan-core@...ts.berlios.de>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>
Subject: Re: [PATCH net-next-2.6 v4 1/1] can: c_can: Added support for Bosch
 C_CAN controller

On 01/12/2011 09:51 AM, Bhupesh SHARMA wrote:
> Hi Marc,
> 
> Thanks for your review.
> Please see my comments inline:
> 
>> -----Original Message-----
>> From: Marc Kleine-Budde [mailto:mkl@...gutronix.de]
>> On 01/11/2011 12:49 PM, Bhupesh Sharma wrote:
...
>>> +static int c_can_close(struct net_device *dev) {
>>> +   struct c_can_priv *priv = netdev_priv(dev);
>>> +
>>> +   netif_stop_queue(dev);
>>> +   napi_disable(&priv->napi);
>>> +   c_can_stop(dev);
>>> +   free_irq(dev->irq, dev);
>>> +   close_candev(dev);
>>> +
>>> +   return 0;
>>> +}
>>> +
>>> +struct net_device *alloc_c_can_dev(void)
>>
>> Please model after alloc_sja1000_dev:
>>
>> struct net_device *alloc_sja1000dev(int sizeof_priv)
>>
>> The private for the _user_ of alloc_c_can_dev is behind the sja1000
>> private, so you can get rid of the void *priv member in the struct
>> c_can_priv. (see below)
> 
> Ok.
> But Wolfgang also suggested to use the *priv* member inside c_can_priv struct
> for board specific details. In my c_can platform driver I use it to
> store the *clk* variable. Do I need to change that as well?

Marc is referring to:

http://lxr.linux.no/#linux+v2.6.37/drivers/net/can/sja1000/sja1000.c#L582

But also there "priv->priv" is used to store a pointer to the board
specific details. Looking to the SJA1000 drivers, only *one* uses
"sizeof_priv > 0", but many other attach a separately allocated
structure to "priv->priv". For that reason, I'm fine with your current
implementation.

Wolfgang.
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