[PATCH 5/8] dma-buf: heaps: system: Remove global variable

[Maxime Ripard <mripard@kernel.org>]

The system heap has been using its struct dma_heap pointer but wasn't
using it anywhere.

Since we'll need additional parameters to attach to that heap type,
let's create a private structure and set it as the dma_heap drvdata,
removing the global variable in the process.

Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/dma-buf/heaps/system_heap.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c
index 9076d47ed2ef..8b5e6344eea4 100644
--- a/drivers/dma-buf/heaps/system_heap.c
+++ b/drivers/dma-buf/heaps/system_heap.c
@@ -19,11 +19,13 @@
 #include <linux/module.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 
-static struct dma_heap *sys_heap;
+struct system_heap {
+	struct dma_heap *heap;
+};
 
 struct system_heap_buffer {
 	struct dma_heap *heap;
 	struct list_head attachments;
 	struct mutex lock;
@@ -422,17 +424,22 @@ static const struct dma_heap_ops system_heap_ops = {
 };
 
 static int system_heap_create(void)
 {
 	struct dma_heap_export_info exp_info;
+	struct system_heap *sys_heap;
+
+	sys_heap = kzalloc(sizeof(*sys_heap), GFP_KERNEL);
+	if (!sys_heap)
+		return -ENOMEM;
 
 	exp_info.name = "system";
 	exp_info.ops = &system_heap_ops;
-	exp_info.priv = NULL;
+	exp_info.priv = sys_heap;
 
-	sys_heap = dma_heap_add(&exp_info);
-	if (IS_ERR(sys_heap))
-		return PTR_ERR(sys_heap);
+	sys_heap->heap = dma_heap_add(&exp_info);
+	if (IS_ERR(sys_heap->heap))
+		return PTR_ERR(sys_heap->heap);
 
 	return 0;
 }
 module_init(system_heap_create);

-- 
2.44.0