From: Michel Thierry <michel.thierry@intel.com>
Date: Thu, 30 Apr 2015 15:06:51 +0000 (+0100)
Subject: drm/i915: Fix 32b overflow check in gen8_ppgtt_alloc_page_directories
X-Git-Tag: omap-for-v4.2/fixes-rc1^2~17^2~54^2~79
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4dd738e9cd791ebac2a009f09f1761e85e7f0805;p=pandora-kernel.git

drm/i915: Fix 32b overflow check in gen8_ppgtt_alloc_page_directories

The patch 69876bed7e008f5fe01538a2d47c09f2862129d0: "drm/i915/gen8:
page directories rework allocation" added an overflow warning, but the
mask had an extra 0. Use less typo-prone option suggested by Dave
instead, to check for (start + length) >= 0x100000000ULL.

This check will be unnecessary after gen8_alloc_va_range handles more
than 4 PDPs (48b addressing).

v2: Really check for 32b overflow (Ville)

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Dave Gordon <david.s.gordon@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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