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Revert "dma-buf: heaps: rk_system_heap: Don't zero pages when dma_buf_release"

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This reverts commit fa31487d66.

Change-Id: I7d2f944a17d13205157267b6ba7aab649e15b84e
Signed-off-by: Simon Xue <xxm@rock-chips.com>
This commit is contained in:
Simon Xue
2025-05-16 18:40:18 +08:00
parent d6e25d0ede
commit fb2d52f341
1 changed files with 21 additions and 0 deletions
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21
drivers/dma-buf/heaps/rk_system_heap.c
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@@ -416,6 +416,24 @@ static void system_heap_vunmap(struct dma_buf *dmabuf, struct iosys_map *map)
iosys_map_clear(map);
}
static int system_heap_zero_buffer(struct system_heap_buffer *buffer)
{
struct sg_table *sgt = &buffer->sg_table;
struct sg_page_iter piter;
struct page *p;
void *vaddr;
int ret = 0;
for_each_sgtable_page(sgt, &piter, 0) {
p = sg_page_iter_page(&piter);
vaddr = kmap_local_page(p);
memset(vaddr, 0, PAGE_SIZE);
kunmap_local(vaddr);
}
return ret;
}
static void system_heap_dma_buf_release(struct dma_buf *dmabuf)
{
struct system_heap_buffer *buffer = dmabuf->priv;
@@ -423,6 +441,9 @@ static void system_heap_dma_buf_release(struct dma_buf *dmabuf)
struct scatterlist *sg;
int i, j;
/* Zero the buffer pages before adding back to the pool */
system_heap_zero_buffer(buffer);
table = &buffer->sg_table;
for_each_sgtable_sg(table, sg, i) {
struct page *page = sg_page(sg);