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Subject: RE: Problem on a kernel driver(SuSE, SMP)
Date: Wed, 4 Sep 2002 16:52:30 -0700
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Thread-Topic: Problem on a kernel driver(SuSE, SMP)
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From: "Libershteyn, Vladimir" <vladimir.libershteyn@hp.com>
To: "Alan Cox" <alan@lxorguk.ukuu.org.uk>
Cc: <linux-kernel@vger.kernel.org>
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> -----Original Message-----
> From: Alan Cox [mailto:alan@lxorguk.ukuu.org.uk]
> Sent: Wednesday, September 04, 2002 4:45 PM
> To: Libershteyn, Vladimir
> Cc: Christoph Hellwig; linux-kernel@vger.kernel.org
> Subject: RE: Problem on a kernel driver(SuSE, SMP)
> 
> 
> On Wed, 2002-09-04 at 18:56, Libershteyn, Vladimir wrote:
> 
> > 	//
> > 	// sleep until data is ready
> > 	//
> > 	down_interruptible(&a->sem[enumerator]);
> 
> Suppose its interrupted. You dont check that and handle it..
> 

Agree, I'll fix it(thanks for noticing that), but it's not the point. 
The point is THIS INSTRUCTION HANGS. NO RETURN FROM IT.

> 
> > 	board_address = ((unsigned long *)((unsigned char 
> *)a->vaddr + OutputQueueFilled));
> > 	length = *board_address;
> 
> You can't poke around in memory directly either. Yes it works 
> on x86 but
> unless you use ioremap combined with readl and friends it 
> wont work they
> way you expect on ia64, x86-64, ...
> 

I did exactly what you've said. You have to understand, 
attached is a PART of the code. All the right initializations were made
prior to that and AGAIN, EVERYTHING WORKS FINE ON A RED HAT AND ON SUSE
NON_SMP

Regards,
Vlad
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