From: Jeremy Kerr <jk@ozlabs.org>
Date: Wed, 15 Oct 2008 02:16:18 +0000 (+1100)
Subject: powerpc/spufs: sputrace: Only enable logging on open(), prevent multiple openers
X-Git-Tag: v2.6.28-rc1~58^2~37
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=baf399273f2ea38e2fcbd4d0b6cc7ba7f7db43eb;p=pandora-kernel.git

powerpc/spufs: sputrace: Only enable logging on open(), prevent multiple openers

Currently, sputrace will start logging to the event buffer before the
log buffer has been open()ed. This results in a heap of "lost samples"
warnings if the sputrace file hasn't yet been opened.

Since the buffer is reset on open() anyway, there's no need to enable
logging when no-one has opened the log.

Because open clears the log, make it return EBUSY for mutliple open
calls.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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