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

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Message-ID: <20140409163054.GA30642@obsidianresearch.com>
Date:	Wed, 9 Apr 2014 10:30:54 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Willy Tarreau <w@....eu>, 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

On Wed, Apr 09, 2014 at 09:53:50AM +0200, Thomas Petazzoni wrote:

> Maybe this is something that Jason can confirm/infirm. I remember
> having a quick look at the core Linux PCI core to see if it was
> somehow checking whether the bridge BAR has been properly configured,
> but I think I concluded it was not the case, and it was just assuming
> that write the memory base/limit in the bridge registers was
> sufficient. 

I think the best way to fail would be to return an error from
mvebu_pcie_align_resource - but we can't create the window in that
call.

Once things get to the BAR write stage it shouldn't fail unfortunately.

Jason
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