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

Commit Message

Christoph Hellwig April 4, 2022, 5:05 a.m. UTC

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

Signed-off-by: Christoph Hellwig <[e-mail]>
Reviewed-by: Anshuman Khandual <[e-mail]>
---
 kernel/dma/swiotlb.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

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;