[PATCH 02/15] swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set
From: Christoph Hellwig <hch@lst.de>
Date: 2022-03-14 07:33:59
Also in:
linux-arm-kernel, linux-hyperv, linux-iommu, linux-mips, linux-pci, linux-riscv, linux-s390, xen-devel
Subsystem:
dma mapping helpers, the rest · Maintainers:
Marek Szyprowski, Linus Torvalds
If force bouncing is enabled we can't release the buffers. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Anshuman Khandual <redacted> --- kernel/dma/swiotlb.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 908eac2527cb1..af9d257501a64 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