drm/i915: rework dev->first_error locking
- reduce the irq disabled section, even for a debugfs file this was
way too long.
- always disable irqs when taking the lock.
v2: Thou shalt not mistake locking for reference counting, so:
- reference count the error_state to protect from concurent freeeing.
This will be only really used in the next patch.
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 49e5d3e..8334550 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -850,10 +850,11 @@
kfree(obj);
}
-static void
-i915_error_state_free(struct drm_device *dev,
- struct drm_i915_error_state *error)
+void
+i915_error_state_free(struct kref *error_ref)
{
+ struct drm_i915_error_state *error = container_of(error_ref,
+ typeof(*error), ref);
int i;
for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
@@ -1102,6 +1103,7 @@
DRM_INFO("capturing error event; look for more information in /debug/dri/%d/i915_error_state\n",
dev->primary->index);
+ kref_init(&error->ref);
error->eir = I915_READ(EIR);
error->pgtbl_er = I915_READ(PGTBL_ER);
@@ -1173,7 +1175,7 @@
spin_unlock_irqrestore(&dev_priv->error_lock, flags);
if (error)
- i915_error_state_free(dev, error);
+ i915_error_state_free(&error->ref);
}
void i915_destroy_error_state(struct drm_device *dev)
@@ -1188,7 +1190,7 @@
spin_unlock_irqrestore(&dev_priv->error_lock, flags);
if (error)
- i915_error_state_free(dev, error);
+ kref_put(&error->ref, i915_error_state_free);
}
#else
#define i915_capture_error_state(x)