linux-kernel - Re: [PATCH v2] bus: mvebu-mbus: Avoid setting an undefined window size

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Date:	Thu, 10 Apr 2014 08:35:40 +0200
From:	Willy Tarreau <w@....eu>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Neil Greatorex <neil@...boyfat.co.uk>,
	linux-arm-kernel@...ts.infradead.org,
	Matthew Minter <matthew_minter@...atex.com>,
	linux-kernel@...r.kernel.org, Jason Cooper <jason@...edaemon.net>
Subject: Re: [PATCH v2] bus: mvebu-mbus: Avoid setting an undefined window size

Hi Jason,

On Wed, Apr 09, 2014 at 10:20:40AM -0600, Jason Gunthorpe wrote:
> On Wed, Apr 09, 2014 at 08:11:29AM +0200, Willy Tarreau wrote:
> 
> > OK I just got it by adding two printk() in pci-mvebu.c. Both functions
> > mvebu_pcie_handle_iobase_change() and mvebu_pcie_handle_membase_change()
> > do pass a size which is in fact a mask (size - 1) and not the real size.
> > So the mbus is fed with an incorrect size which is off by one :
> 
> Yes, that is right. I tested my patch here and didn't see any problem,
> but I realize now that the mbus code is bailing early due to this:
> 
> kernel: mvebu_mbus: cannot add window '4:e8', conflicts with another window
> 
> Which I've never got around to fixing.. (whole other story there)
> 
> Your patch looks fine, and it obviously needs to be sequenced before
> mine. (Thomas/Jason C: how do you want to do this?)
> 
> Reviewed-By: Jason Gunthorpe <jgunthorpe@...idianresearch.com>

OK, thank you. I've updated the attached patch with your better description.

Cheers,
Willy


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