[PATCH 02/15] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set

Christoph Hellwig
2022-04-04T05:05:46Z

If force bouncing is enabled we can't release the buffers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
kernel/dma/swiotlb.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 73a41cec9e386..98bb0eb44a7bf 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -369,6 +369,9 @@ void __init swiotlb_exit(void)
unsigned long tbl_vaddr;
size_t tbl_size, slots_size;

+ if (swiotlb_force = SWIOTLB_FORCE)
+ return;
+
if (!mem->nslabs)
return;

--
2.30.2