From: Daniel Thompson <daniel.thompson@linaro.org>
Date: Mon, 27 Oct 2014 18:51:43 +0000 (+0000)
Subject: staging: android: logger: Fix log corruption regression
X-Git-Tag: omap-for-v3.19/fixes-not-urgent-part1~14^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5fecf3a1e1a0af61eb34eb6976ec9f59cca65d3f;p=pandora-kernel.git

staging: android: logger: Fix log corruption regression

Since commit cd678fce4280 ("switch logger to ->write_iter()"), any
attempt to write to the log results in the log data being written over
its own metadata, thus rendering the log unreadable.

The problem was first detected when I ran an Android userspace on the
v3.18-rc1 kernel. However the issue can also be observed with a
non-Android userspace by using echo/cat to write to/from /dev/log_main .

This patch resolves the problem by using a temporary to track the status
of not-yet-committed writes to the log buffer.

Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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