From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Thu, 23 May 2013 10:55:35 +0000 (+0300)
Subject: drm/i915: avoid big kmallocs on reading error state
X-Git-Tag: v3.11-rc1~65^2~105^2~55
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edc3d8848dc9fe2a470316363dab8ef211d77e01;p=pandora-kernel.git

drm/i915: avoid big kmallocs on reading error state

Sometimes when user is trying to get error state out from
debugfs after gpu hang, the memory is low and/or fragmented
enough that kmalloc in seq_file will fail.

Prevent big kmalloc by avoiding seq_file and instead convert
error state to string in smaller chunks.

v2: better alloc flags, better truncate, correct
locking, and error handling improvements (Chris Wilson)

v3: printf annotations (Daniel Vetter)

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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