drm/i915: Allocate the PCI resource for the MCHBAR

We were failing when trying to allocate the resource for MMIO of the
MCHBAR because we forgot to specify what type of resource we wanted.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: stable@kernel.org
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/gpu/drm/i915/i915_dma.c

@@ -891,7 +891,7 @@ intel_alloc_mchbar_resource(struct drm_device *dev)
 	int reg = IS_I965G(dev) ? MCHBAR_I965 : MCHBAR_I915;
 	u32 temp_lo, temp_hi = 0;
 	u64 mchbar_addr;
-	int ret = 0;
+	int ret;
 
 	if (IS_I965G(dev))
 		pci_read_config_dword(dev_priv->bridge_dev, reg + 4, &temp_hi);
@@ -901,22 +901,23 @@ intel_alloc_mchbar_resource(struct drm_device *dev)
 	/* If ACPI doesn't have it, assume we need to allocate it ourselves */
 #ifdef CONFIG_PNP
 	if (mchbar_addr &&
-	    pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE)) {
-		ret = 0;
-		goto out;
-	}
+	    pnp_range_reserved(mchbar_addr, mchbar_addr + MCHBAR_SIZE))
+		return 0;
 #endif
 
 	/* Get some space for it */
-	ret = pci_bus_alloc_resource(dev_priv->bridge_dev->bus, &dev_priv->mch_res,
+	dev_priv->mch_res.name = "i915 MCHBAR";
+	dev_priv->mch_res.flags = IORESOURCE_MEM;
+	ret = pci_bus_alloc_resource(dev_priv->bridge_dev->bus,
+				     &dev_priv->mch_res,
 				     MCHBAR_SIZE, MCHBAR_SIZE,
 				     PCIBIOS_MIN_MEM,
-				     0,   pcibios_align_resource,
+				     0, pcibios_align_resource,
 				     dev_priv->bridge_dev);
 	if (ret) {
 		DRM_DEBUG_DRIVER("failed bus alloc: %d\n", ret);
 		dev_priv->mch_res.start = 0;
-		goto out;
+		return ret;
 	}
 
 	if (IS_I965G(dev))
@@ -925,8 +926,7 @@ intel_alloc_mchbar_resource(struct drm_device *dev)
 
 	pci_write_config_dword(dev_priv->bridge_dev, reg,
 			       lower_32_bits(dev_priv->mch_res.start));
-out:
-	return ret;
+	return 0;
 }
 
 /* Setup MCHBAR if possible, return true if we should disable it again */