From: Ben Widawsky <benjamin.widawsky@intel.com>
Date: Sat, 5 Apr 2014 05:41:07 +0000 (-0700)
Subject: drm/i915: Unref context on failed eb_create
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~44^2~63^2~38
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=935f38d6948eb0bf10ac691d010fec9e9163a9c6;p=pandora-kernel.git

drm/i915: Unref context on failed eb_create

I opted to do this instead of grabbing the context reference after
eb_create since eb_create can potentially call the shrinker, and that
makes things very complicated. This simple patch balances the ref count
without requiring a great deal of review to make sure the shrinker path
is safe.

Theoretically (by design) the shrinker can end up destroying a context,
which enforces the reasoning for doing the fix this way instead of
moving the reference to later in the function.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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