From: Neil Turton <nturton@solarflare.com>
Date: Mon, 11 Apr 2011 10:42:43 +0000 (+0100)
Subject: sfc: Use rmb() to ensure reads occur in order
X-Git-Tag: v2.6.39-rc5~40^2~16^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcfa060468a4edcf776f0c1211d826d5de1668c1;p=pandora-kernel.git

sfc: Use rmb() to ensure reads occur in order

Enabling write-combining may also enable read reordering.  The BIU is
only guaranteed to read from a 128-bit CSR or 64-bit SRAM word when
the host reads from its lowest address; otherwise the BIU may use the
latched value.  Therefore we need to reinstate the read memory
barriers after the first read operation for each CSR or SRAM word.

Signed-off-by; Ben Hutchings <bhutchings@solarflare.com>
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