[PATCH 1/8] dma-heap: Add proper kref handling on dma-buf heaps

[Ketil Johnsen <ketil.johnsen@arm.com>]

From: John Stultz <jstultz@google.com>

Add proper reference counting on the dma_heap structure. While
existing heaps are built-in, we may eventually have heaps loaded
from modules, and we'll need to be able to properly handle the
references to the heaps

Signed-off-by: John Stultz <jstultz@google.com>
Signed-off-by: T.J. Mercier <tjmercier@google.com>
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
[Yong: Just add comment for "minor" and "refcount"]
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
[Yunfei: Change reviewer's comments]
Signed-off-by: Florent Tomasin <florent.tomasin@arm.com>
[Florent: Rebase]
Signed-off-by: Ketil Johnsen <ketil.johnsen@arm.com>
[Ketil: Rebase]
---
 drivers/dma-buf/dma-heap.c | 29 +++++++++++++++++++++++++++++
 include/linux/dma-heap.h   |  2 ++
 2 files changed, 31 insertions(+)

diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c
index ac5f8685a6494..9fd365ddbd517 100644
--- a/drivers/dma-buf/dma-heap.c
+++ b/drivers/dma-buf/dma-heap.c
@@ -12,6 +12,7 @@
 #include <linux/dma-heap.h>
 #include <linux/err.h>
 #include <linux/export.h>
+#include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/nospec.h>
 #include <linux/syscalls.h>
@@ -31,6 +32,7 @@
  * @heap_devt:		heap device node
  * @list:		list head connecting to list of heaps
  * @heap_cdev:		heap char device
+ * @refcount:		reference counter for this heap device
  *
  * Represents a heap of memory from which buffers can be made.
  */
@@ -41,6 +43,7 @@ struct dma_heap {
 	dev_t heap_devt;
 	struct list_head list;
 	struct cdev heap_cdev;
+	struct kref refcount;
 };
 
 static LIST_HEAD(heap_list);
@@ -248,6 +251,7 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 	if (!heap)
 		return ERR_PTR(-ENOMEM);
 
+	kref_init(&heap->refcount);
 	heap->name = exp_info->name;
 	heap->ops = exp_info->ops;
 	heap->priv = exp_info->priv;
@@ -313,6 +317,31 @@ struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info)
 }
 EXPORT_SYMBOL_NS_GPL(dma_heap_add, "DMA_BUF_HEAP");
 
+static void dma_heap_release(struct kref *ref)
+{
+	struct dma_heap *heap = container_of(ref, struct dma_heap, refcount);
+	unsigned int minor = MINOR(heap->heap_devt);
+
+	mutex_lock(&heap_list_lock);
+	list_del(&heap->list);
+	mutex_unlock(&heap_list_lock);
+
+	device_destroy(dma_heap_class, heap->heap_devt);
+	cdev_del(&heap->heap_cdev);
+	xa_erase(&dma_heap_minors, minor);
+
+	kfree(heap);
+}
+
+/**
+ * dma_heap_put - drops a reference to a dmabuf heap, potentially freeing it
+ * @heap: DMA-Heap whose reference count to decrement
+ */
+void dma_heap_put(struct dma_heap *heap)
+{
+	kref_put(&heap->refcount, dma_heap_release);
+}
+
 static char *dma_heap_devnode(const struct device *dev, umode_t *mode)
 {
 	return kasprintf(GFP_KERNEL, "dma_heap/%s", dev_name(dev));
diff --git a/include/linux/dma-heap.h b/include/linux/dma-heap.h
index 648328a64b27e..ff57741700f5f 100644
--- a/include/linux/dma-heap.h
+++ b/include/linux/dma-heap.h
@@ -46,6 +46,8 @@ const char *dma_heap_get_name(struct dma_heap *heap);
 
 struct dma_heap *dma_heap_add(const struct dma_heap_export_info *exp_info);
 
+void dma_heap_put(struct dma_heap *heap);
+
 extern bool mem_accounting;
 
 #endif /* _DMA_HEAPS_H */
-- 
2.43.0