From 564b84978df2bf83d334940f1a1190702579f79f Mon Sep 17 00:00:00 2001
From: Guillaume LECERF <glecerf@gmail.com>
Date: Sat, 24 Apr 2010 17:58:17 +0200
Subject: [PATCH] mtd: cfi_cmdset_0002: do not fail on no extended query table
 as they are both optional

After looking at AMD's CFI specification [1], both of the extended query
tables are optional. Thus, it looks like relying that at least one of
those tables exist is a bug in cfi_cmdset_0002.

This patch inverts the logic and checks for unlock function pointers before
exiting on error. This approach leaves place to add a call to a fixup
function to try to handle chips compatible with the early AMD specification
from 1995 [2].

[1] http://www.amd.com/us-en/assets/content_type/DownloadableAssets/cfi_r20.pdf
[2] http://noel.feld.cvut.cz/hw/amd/20158a.pdf

Signed-off-by: Guillaume LECERF <glecerf@gmail.com>
Reviewed-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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