From: Ben Zhang <benzh@chromium.org>
Date: Fri, 31 Oct 2014 00:14:21 +0000 (-0700)
Subject: pstore/ram: Strip ramoops header for correct decompression
X-Git-Tag: omap-for-v3.19/fixes-rc1~149^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a28726b4fb624f81d637a8afb9ea12fc16500f61;p=pandora-kernel.git

pstore/ram: Strip ramoops header for correct decompression

pstore compression/decompression was added during 3.12.
The ramoops driver prepends a "====timestamp.timestamp-C|D\n"
header to the compressed record before handing it over to pstore
driver which doesn't know about the header. In pstore_decompress(),
the pstore driver reads the first "==" as a zlib header, so the
decompression always fails. For example, this causes the driver
to write /dev/pstore/dmesg-ramoops-0.enc.z instead of
/dev/pstore/dmesg-ramoops-0.

This patch makes the ramoops driver remove the header before
pstore decompression.

Signed-off-by: Ben Zhang <benzh@chromium.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
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