linux-kernel - [PATCH] dma-direct: use the correct size for dma_set

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Date:   Wed, 22 Jun 2022 12:14:24 -0700
From:   Dexuan Cui <decui@...rosoft.com>
To:     hch@....de, m.szyprowski@...sung.com, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc:     linux-hyperv@...r.kernel.org, mikelley@...rosoft.com,
        Andrea.Parri@...rosoft.com, Tianyu.Lan@...rosoft.com,
        Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH] dma-direct: use the correct size for dma_set_encrypted()

The third parameter of dma_set_encrypted() is a size in bytes rather than
the number of pages.

Fixes: 4d0564785bb0 ("dma-direct: factor out dma_set_{de,en}crypted helpers")
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
---
 kernel/dma/direct.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index e978f36e6be8..8d0b68a17042 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -357,7 +357,7 @@ void dma_direct_free(struct device *dev, size_t size,
 	} else {
 		if (IS_ENABLED(CONFIG_ARCH_HAS_DMA_CLEAR_UNCACHED))
 			arch_dma_clear_uncached(cpu_addr, size);
-		if (dma_set_encrypted(dev, cpu_addr, 1 << page_order))
+		if (dma_set_encrypted(dev, cpu_addr, size))
 			return;
 	}
 
@@ -392,7 +392,6 @@ void dma_direct_free_pages(struct device *dev, size_t size,
 		struct page *page, dma_addr_t dma_addr,
 		enum dma_data_direction dir)
 {
-	unsigned int page_order = get_order(size);
 	void *vaddr = page_address(page);
 
 	/* If cpu_addr is not from an atomic pool, dma_free_from_pool() fails */
@@ -400,7 +399,7 @@ void dma_direct_free_pages(struct device *dev, size_t size,
 	    dma_free_from_pool(dev, vaddr, size))
 		return;
 
-	if (dma_set_encrypted(dev, vaddr, 1 << page_order))
+	if (dma_set_encrypted(dev, vaddr, size))
 		return;
 	__dma_direct_free_pages(dev, page, size);
 }
-- 
2.25.1