[Intel-gfx] [PATCH] drm/i915: Do not leak dev_priv->l3_parity.remap_info[]

[Joonas Lahtinen]

Add intel_irq_fini() for placing the deinitialization code,
starting with freeing dev_priv->l3_parity.remap_info[].

Signed-off-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c   |  6 ++++--
 drivers/gpu/drm/i915/i915_drv.h   |  1 +
 drivers/gpu/drm/i915/i915_irq.c   | 20 +++++++++++++++++++-
 drivers/gpu/drm/i915/i915_sysfs.c | 23 ++++++++++++-----------
 4 files changed, 36 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index c7d68e7..8228b4c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -856,7 +856,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
 	intel_init_audio_hooks(dev_priv);
 	ret = i915_gem_load_init(dev_priv);
 	if (ret < 0)
-		goto err_workqueues;
+		goto err_irq;
 
 	intel_display_crc_init(dev_priv);
 
@@ -868,7 +868,8 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
 
 	return 0;
 
-err_workqueues:
+err_irq:
+	intel_irq_fini(dev_priv);
 	i915_workqueues_cleanup(dev_priv);
 err_engines:
 	i915_engines_cleanup(dev_priv);
@@ -883,6 +884,7 @@ static void i915_driver_cleanup_early(struct drm_i915_private *dev_priv)
 {
 	i915_perf_fini(dev_priv);
 	i915_gem_load_cleanup(dev_priv);
+	intel_irq_fini(dev_priv);
 	i915_workqueues_cleanup(dev_priv);
 	i915_engines_cleanup(dev_priv);
 }
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d1f7c48..618ea2d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3060,6 +3060,7 @@ void i915_handle_error(struct drm_i915_private *dev_priv,
 		       const char *fmt, ...);
 
 extern void intel_irq_init(struct drm_i915_private *dev_priv);
+extern void intel_irq_fini(struct drm_i915_private *dev_priv);
 int intel_irq_install(struct drm_i915_private *dev_priv);
 void intel_irq_uninstall(struct drm_i915_private *dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index fd97fe0..0e4dcbeb 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1236,7 +1236,7 @@ static void gen6_pm_rps_work(struct work_struct *work)
 static void ivybridge_parity_work(struct work_struct *work)
 {
 	struct drm_i915_private *dev_priv =
-		container_of(work, struct drm_i915_private, l3_parity.error_work);
+		container_of(work, typeof(*dev_priv), l3_parity.error_work);
 	u32 error_status, row, bank, subbank;
 	char *parity_event[6];
 	uint32_t misccpctl;
@@ -4233,11 +4233,15 @@ static void i965_irq_uninstall(struct drm_device * dev)
 void intel_irq_init(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = &dev_priv->drm;
+	int i;
 
 	intel_hpd_init_work(dev_priv);
 
 	INIT_WORK(&dev_priv->rps.work, gen6_pm_rps_work);
+
 	INIT_WORK(&dev_priv->l3_parity.error_work, ivybridge_parity_work);
+	for (i = 0; i < MAX_L3_SLICES; ++i)
+		dev_priv->l3_parity.remap_info[i] = NULL;
 
 	if (HAS_GUC_SCHED(dev_priv))
 		dev_priv->pm_guc_events = GEN9_GUC_TO_HOST_INT_EVENT;
@@ -4363,6 +4367,20 @@ void intel_irq_init(struct drm_i915_private *dev_priv)
 }
 
 /**
+ * intel_irq_fini - deinitializes IRQ support
+ * @i915: i915 device instance
+ *
+ * This function deinitializes all the IRQ support.
+ */
+void intel_irq_fini(struct drm_i915_private *i915)
+{
+	int i;
+
+	for (i = 0; i < MAX_L3_SLICES; ++i)
+		kfree(i915->l3_parity.remap_info[i]);
+}
+
+/**
  * intel_irq_install - enables the hardware interrupt
  * @dev_priv: i915 device instance
  *
diff --git a/drivers/gpu/drm/i915/i915_sysfs.c b/drivers/gpu/drm/i915/i915_sysfs.c
index f3fdfda..f9e009c 100644
--- a/drivers/gpu/drm/i915/i915_sysfs.c
+++ b/drivers/gpu/drm/i915/i915_sysfs.c
@@ -181,8 +181,8 @@ i915_l3_write(struct file *filp, struct kobject *kobj,
 	struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 	struct drm_device *dev = &dev_priv->drm;
 	struct i915_gem_context *ctx;
-	u32 *temp = NULL; /* Just here to make handling failures easy */
 	int slice = (int)(uintptr_t)attr->private;
+	u32 **remap_info;
 	int ret;
 
 	if (!HAS_HW_CONTEXTS(dev_priv))
@@ -196,11 +196,12 @@ i915_l3_write(struct file *filp, struct kobject *kobj,
 	if (ret)
 		return ret;
 
-	if (!dev_priv->l3_parity.remap_info[slice]) {
-		temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
-		if (!temp) {
-			mutex_unlock(&dev->struct_mutex);
-			return -ENOMEM;
+	remap_info = &dev_priv->l3_parity.remap_info[slice];
+	if (!*remap_info) {
+		*remap_info = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
+		if (!*remap_info) {
+			ret = -ENOMEM;
+			goto out;
 		}
 	}
 
@@ -208,18 +209,18 @@ i915_l3_write(struct file *filp, struct kobject *kobj,
 	 * aren't propagated. Since I cannot find a stable way to reset the GPU
 	 * at this point it is left as a TODO.
 	*/
-	if (temp)
-		dev_priv->l3_parity.remap_info[slice] = temp;
-
-	memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count);
+	memcpy(*remap_info + (offset/4), buf, count);
 
 	/* NB: We defer the remapping until we switch to the context */
 	list_for_each_entry(ctx, &dev_priv->context_list, link)
 		ctx->remap_slice |= (1<<slice);
 
+	ret = count;
+
+out:
 	mutex_unlock(&dev->struct_mutex);
 
-	return count;
+	return ret;
 }
 
 static struct bin_attribute dpf_attrs = {
-- 
2.7.4