drm/i915: Skip stolen region initialisation if none is reserved

Paulo reported that if he set the amount of reserved memory to 0, then
we emitted a warning about a conflict before disabling our use of stolen
memory. This was introduced with

commit eaba1b8f3379b5d100bd146b9a41d28348bdfd09
Author: Chris Wilson <[email protected]>
Date:   Thu Jul 4 12:28:35 2013 +0100

    drm/i915: Verify that our stolen memory doesn't conflict

and is simply fixed by checking for a no reservation first.

Reported-by: Paulo Zanoni <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Cc: Paulo Zanoni <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>

diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index 9969d10b80f518c6d032d45ff57cf2839afbd5bf..e15a1d90037d7709b2f4c489074ef5779ac6c1a8 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -201,6 +201,9 @@ int i915_gem_init_stolen(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        int bios_reserved = 0;
 
+       if (dev_priv->gtt.stolen_size == 0)
+               return 0;
+
        dev_priv->mm.stolen_base = i915_stolen_to_physical(dev);
        if (dev_priv->mm.stolen_base == 0)
                return 0;