Messages in this thread | | | Date | Thu, 25 Nov 2021 13:28:33 +0000 | Subject | Re: [PATCH] dma_heap: use sg_table.orig_nents in sg_table release flow | From | Robin Murphy <> |
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On 2021-11-25 12:46, guangming.cao@mediatek.com wrote: > From: Guangming <Guangming.Cao@mediatek.com> > > Use (sg_table.orig_nents) rather than (sg_table.nents) to traverse > sg_table to free sg_table. > Use (sg_table.nents) maybe will casuse some pages can't be freed.
...and this sort of bug is precisely why we have the for_each_sgtable_sg() helper ;)
Robin.
> Signed-off-by: Guangming <Guangming.Cao@mediatek.com> > --- > drivers/dma-buf/heaps/system_heap.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c > index 23a7e74ef966..ce10d4eb674c 100644 > --- a/drivers/dma-buf/heaps/system_heap.c > +++ b/drivers/dma-buf/heaps/system_heap.c > @@ -289,7 +289,7 @@ static void system_heap_dma_buf_release(struct dma_buf *dmabuf) > int i; > > table = &buffer->sg_table; > - for_each_sg(table->sgl, sg, table->nents, i) { > + for_each_sg(table->sgl, sg, table->orig_nents, i) { > struct page *page = sg_page(sg); > > __free_pages(page, compound_order(page)); >
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