[Intel-gfx] [PATCH v2 1/4] drm/i915: fix ilk rc6 teardown locking

[Ben Widawsky]

In the failure cases during rc6 initialization, both the power context
and render context may get !refcount without holding struct_mutex.
However, on rc6 disabling, the lock is held by the caller.

Rearranged the locking so that it's safe in both cases.

Signed-off-by: Ben Widawsky <b...@bwidawsk.net>
---
 drivers/gpu/drm/i915/intel_display.c |   11 ++++++++---
 1 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c 
b/drivers/gpu/drm/i915/intel_display.c
index 49fb54f..2e3c626 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6025,13 +6025,14 @@ intel_alloc_context_page(struct drm_device *dev)
        struct drm_i915_gem_object *ctx;
        int ret;
 
+       WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
        ctx = i915_gem_alloc_object(dev, 4096);
        if (!ctx) {
                DRM_DEBUG("failed to alloc power context, RC6 disabled\n");
                return NULL;
        }
 
-       mutex_lock(&dev->struct_mutex);
        ret = i915_gem_object_pin(ctx, 4096, true);
        if (ret) {
                DRM_ERROR("failed to pin power context: %d\n", ret);
@@ -6043,7 +6044,6 @@ intel_alloc_context_page(struct drm_device *dev)
                DRM_ERROR("failed to set-domain on power context: %d\n", ret);
                goto err_unpin;
        }
-       mutex_unlock(&dev->struct_mutex);
 
        return ctx;
 
@@ -6608,9 +6608,12 @@ void ironlake_enable_rc6(struct drm_device *dev)
        if (!i915_enable_rc6)
                return;
 
+       mutex_lock(&dev->struct_mutex);
        ret = ironlake_setup_rc6(dev);
-       if (ret)
+       if (ret) {
+               mutex_unlock(&dev->struct_mutex);
                return;
+       }
 
        /*
         * GPU can automatically power down the render unit if given a page
@@ -6619,6 +6622,7 @@ void ironlake_enable_rc6(struct drm_device *dev)
        ret = BEGIN_LP_RING(6);
        if (ret) {
                ironlake_teardown_rc6(dev);
+               mutex_unlock(&dev->struct_mutex);
                return;
        }
 
@@ -6636,6 +6640,7 @@ void ironlake_enable_rc6(struct drm_device *dev)
 
        I915_WRITE(PWRCTXA, dev_priv->pwrctx->gtt_offset | PWRCTX_EN);
        I915_WRITE(RSTDBYCTL, I915_READ(RSTDBYCTL) & ~RCX_SW_EXIT);
+       mutex_unlock(&dev->struct_mutex);
 }
 
 
-- 
1.7.3.4

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