netdev - Re: [kernel,2.6.33-git11] lib8390: use spin_lock

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Message-Id: <20100308212433.0fa3e453.ken_kawasaki@spring.nifty.jp>
Date:	Mon, 8 Mar 2010 21:24:33 +0900
From:	Ken Kawasaki <ken_kawasaki@...ing.nifty.jp>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: [kernel,2.6.33-git11] lib8390: use spin_lock_irqsave for
 locking


> This change is not correct.
> 
> disable_irq is being intentionally used because the reset
> sequence can take a very long time and we don't want to
> have cpu interrupts disabled during the entire sequence.
> 
> Otherwise slow serial devices will drop characters and
> stuff like that.


Actually, disable_irq is _not_ safe for lib8390 on SMP system.
Same CPU or other CPU can call enable_irq.

so lib8390 does not work properly on my SMP system.

Ken.

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