From: Hervé Fache <h-fache@ti.com>
Date: Tue, 13 Mar 2012 15:07:53 +0000 (+0100)
Subject: mtd: phram: dot not crash when built-in and passing boot param
X-Git-Tag: v3.4-rc1~16^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2a2a84d35e0f42ad26e326ec4258f6a8b8eecbe;p=pandora-kernel.git

mtd: phram: dot not crash when built-in and passing boot param

This patch is based on Ville Herva's similar patch to block2mtd.

Trying to pass a parameter through the kernel command line when built-in would
crash the kernel, as phram_setup() was called so early that kmalloc() was not
functional yet.

This patch only saves the parameter string at the early boot stage, and parses
it later when init_phram() is called. The same happens in both module and
built-in cases.

With this patch, I can boot with a statically-compiled phram, and mount a
ext2 root fs from physical RAM, without the need for a initrd.

This has been tested in built-in and module cases, with and without a
parameter string.

Artem: amended comments a bit

Signed-off-by: Hervé Fache <h-fache@ti.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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