From: Daniel Vetter <daniel.vetter@ffwll.ch>
Date: Tue, 11 Dec 2012 15:51:35 +0000 (+0100)
Subject: drm: optimize drm_framebuffer_remove
X-Git-Tag: v3.9-rc1~83^2~38^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b62584e366ebcb3adffefad373a5abc4c4b677ca;p=pandora-kernel.git

drm: optimize drm_framebuffer_remove

Now that all framebuffer usage is properly refcounted, we are no
longer required to hold the modeset locks while dropping the last
reference. Hence implemented a fastpath which avoids the potential
stalls associated with grabbing mode_config.lock for the case where
there's no other reference around.

Explain in a big comment why it is safe. Also update kerneldocs with
the new locking rules around drm_framebuffer_remove.

Reviewed-by: Rob Clark <rob@ti.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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