On Thu, Nov 25, 2021 at 11:48 PM [off-list ref] wrote:

From: Guangming <redacted>

For previous version, it uses 'sg_table.nent's to traverse sg_table in pages
free flow.
However, 'sg_table.nents' is reassigned in 'dma_map_sg', it means the number of
created entries in the DMA adderess space.
So, use 'sg_table.nents' in pages free flow will case some pages can't be freed.

Here we should use sg_table.orig_nents to free pages memory, but use the
sgtable helper 'for each_sgtable_sg'(, instead of the previous rather common
helper 'for_each_sg' which maybe cause memory leak) is much better.

Fixes: d963ab0f15fb0 ("dma-buf: system_heap: Allocate higher order pages if available")
Signed-off-by: Guangming <redacted>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Cc: <redacted> # 5.11.*

Thanks so much for catching this and sending in all the revisions!

Reviewed-by: John Stultz <redacted>

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