From: Bjorn Helgaas <bhelgaas@google.com>
Date: Mon, 5 Aug 2013 22:15:10 +0000 (-0600)
Subject: PCI: Align bridge I/O windows as required by downstream devices & bridges
X-Git-Tag: v3.12-rc1~177^2~7^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d1d66780ecd12c9518835303f5302fc5262d49b;p=pandora-kernel.git

PCI: Align bridge I/O windows as required by downstream devices & bridges

An upstream bridge's I/O window must be at least as aligned as any
downstream device or bridge requires.  In particular, if the upstream
bridge supports 1K alignment but a downstream bridge requires 4K alignment,
the upstream window must also be 4K aligned.

Therefore, do not reduce the required alignment ("min_align") based on
the upstream bridge's capabilities.

Reported-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Suggested-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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