From: Christoph Hellwig <hch@lst.de>
Date: Mon, 14 Feb 2022 09:01:26 +0000 (+0100)
Subject: swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3469d36d470df148e8d940c1a6399510562bf3b0;p=linux.git

swiotlb: make swiotlb_exit a no-op if SWIOTLB_FORCE is set

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>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---

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;