netdev - Re: [PATCH v3] Fix SJA1000 command register writes on SMP systems

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Date:	Wed, 19 May 2010 18:23:59 +0200
From:	Oliver Hartkopp <socketcan@...tkopp.net>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	David Miller <davem@...emloft.net>,
	SocketCAN Core Mailing List <socketcan-core@...ts.berlios.de>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Wolfgang Grandegger <wg@...ndegger.com>
Subject: Re: [PATCH v3] Fix SJA1000 command register writes on SMP systems

On 18.05.2010 23:31, Sam Ravnborg wrote:
> Hi Oliver.
> 
>> diff --git a/drivers/net/can/sja1000/sja1000.h b/drivers/net/can/sja1000/sja1000.h
>> index 97a622b..de8e778 100644
>> --- a/drivers/net/can/sja1000/sja1000.h
>> +++ b/drivers/net/can/sja1000/sja1000.h
>> @@ -167,6 +167,7 @@ struct sja1000_priv {
>>  
>>  	void __iomem *reg_base;	 /* ioremap'ed address to registers */
>>  	unsigned long irq_flags; /* for request_irq() */
>> +	spinlock_t cmdreg_lock;  /* lock for concurrent cmd register writes */
>>  
>>  	u16 flags;		/* custom mode flags */
>>  	u8 ocr;			/* output control register */
> 
> You define your spinlock inside a struct so you cannot use
> DEFINE_SPINLOCK().
> 
> But then you need to use spin_lock_init() - which I fail to see
> you are doing in your patch.

Indeed. Sorry.

Will send a patch with spin_lock_init() e.g. to enable the spinlock debugging ...

Regards,
Oliver
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