linux-kernel - [PATCH] Remove old no iommu direct mapping code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190423200335.3888-1-tmurphy@arista.com>
Date:   Tue, 23 Apr 2019 21:03:34 +0100
From:   Tom Murphy <tmurphy@...sta.com>
To:     iommu@...ts.linux-foundation.org
Cc:     murphyt7@....ie, Tom Murphy <tmurphy@...sta.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] Remove old no iommu direct mapping code

These checks were intended to handle devices not mapped by the IOMMU.
Since the AMD IOMMU driver uses per-device dma_ops these functions can
no longer be called by direct mapped devices. So these checks aren't
needed anymore.

Signed-off-by: Tom Murphy <tmurphy@...sta.com>
---
 drivers/iommu/amd_iommu.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index b319e51c379b..67cdc9e5304b 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2503,9 +2503,7 @@ static dma_addr_t map_page(struct device *dev, struct page *page,
 	u64 dma_mask;
 
 	domain = get_domain(dev);
-	if (PTR_ERR(domain) == -EINVAL)
-		return (dma_addr_t)paddr;
-	else if (IS_ERR(domain))
+	if (IS_ERR(domain))
 		return DMA_MAPPING_ERROR;
 
 	dma_mask = *dev->dma_mask;
@@ -2676,11 +2674,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
 	struct page *page;
 
 	domain = get_domain(dev);
-	if (PTR_ERR(domain) == -EINVAL) {
-		page = alloc_pages(flag, get_order(size));
-		*dma_addr = page_to_phys(page);
-		return page_address(page);
-	} else if (IS_ERR(domain))
+	if (IS_ERR(domain))
 		return NULL;
 
 	dma_dom   = to_dma_ops_domain(domain);
-- 
2.17.1