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From cdd7104850d34cfe22902c45d69dac6cb506b087 Mon Sep 17 00:00:00 2001
From: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
Date: Fri, 26 Feb 2021 11:00:54 -0800
Subject: [PATCH] Add a quick fix to resolve USB gadget DMA issue.
This is a quick fix to resolve USB gadget DMA issue and it should
be removed when a real fix is added.
Tested: Keyboard and mouse in KVM feature worked.
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
---
kernel/dma/mapping.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c
index 51bb8fa8eb89..7bcfedeb1e30 100644
--- a/kernel/dma/mapping.c
+++ b/kernel/dma/mapping.c
@@ -146,8 +146,10 @@ dma_addr_t dma_map_page_attrs(struct device *dev, struct page *page,
BUG_ON(!valid_dma_direction(dir));
+#if 0 /* Quick fix to resolve USB gadget issue */
if (WARN_ON_ONCE(!dev->dma_mask))
return DMA_MAPPING_ERROR;
+#endif
if (dma_map_direct(dev, ops))
addr = dma_direct_map_page(dev, page, offset, size, dir, attrs);
--
2.17.1
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