From 79d2427338e8da362678de32a1c8af1dc8a9810a Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 28 Jun 2011 11:27:47 +0100 Subject: [PATCH] drm/i915/overlay: Fix unpinning along init error paths As pointed out by Dan Carpenter, it was seemingly possible to hit an error whilst mapping the buffer for the regs (except the only likely error returns should not happen during init) and so leak a pin count on the bo. To handle this we would need to reacquire the struct mutex, so for simplicity rearrange for the lock to be held for the entire function. For extra pedagogy, test that we only call init once. Signed-off-by: Chris Wilson Reviewed-by: Keith Packard Signed-off-by: Keith Packard --- drivers/gpu/drm/i915/intel_overlay.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_overlay.c b/drivers/gpu/drm/i915/intel_overlay.c index 56a8e2aea19c..9e2959bc91cd 100644 --- a/drivers/gpu/drm/i915/intel_overlay.c +++ b/drivers/gpu/drm/i915/intel_overlay.c @@ -1409,6 +1409,11 @@ void intel_setup_overlay(struct drm_device *dev) overlay = kzalloc(sizeof(struct intel_overlay), GFP_KERNEL); if (!overlay) return; + + mutex_lock(&dev->struct_mutex); + if (WARN_ON(dev_priv->overlay)) + goto out_free; + overlay->dev = dev; reg_bo = i915_gem_alloc_object(dev, PAGE_SIZE); @@ -1416,8 +1421,6 @@ void intel_setup_overlay(struct drm_device *dev) goto out_free; overlay->reg_bo = reg_bo; - mutex_lock(&dev->struct_mutex); - if (OVERLAY_NEEDS_PHYSICAL(dev)) { ret = i915_gem_attach_phys_object(dev, reg_bo, I915_GEM_PHYS_OVERLAY_REGS, @@ -1442,8 +1445,6 @@ void intel_setup_overlay(struct drm_device *dev) } } - mutex_unlock(&dev->struct_mutex); - /* init all values */ overlay->color_key = 0x0101fe; overlay->brightness = -19; @@ -1452,7 +1453,7 @@ void intel_setup_overlay(struct drm_device *dev) regs = intel_overlay_map_regs(overlay); if (!regs) - goto out_free_bo; + goto out_unpin_bo; memset(regs, 0, sizeof(struct overlay_registers)); update_polyphase_filter(regs); @@ -1461,15 +1462,17 @@ void intel_setup_overlay(struct drm_device *dev) intel_overlay_unmap_regs(overlay, regs); dev_priv->overlay = overlay; + mutex_unlock(&dev->struct_mutex); DRM_INFO("initialized overlay support\n"); return; out_unpin_bo: - i915_gem_object_unpin(reg_bo); + if (!OVERLAY_NEEDS_PHYSICAL(dev)) + i915_gem_object_unpin(reg_bo); out_free_bo: drm_gem_object_unreference(®_bo->base); - mutex_unlock(&dev->struct_mutex); out_free: + mutex_unlock(&dev->struct_mutex); kfree(overlay); return; }