linux-kernel - [PATCH 2/4] iommu/amd: Correctly set flags for handle_mm

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Message-Id: <1447773099-2444-3-git-send-email-joro@8bytes.org>
Date:	Tue, 17 Nov 2015 16:11:37 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	iommu@...ts.linux-foundation.org
Cc:	Oded Gabbay <oded.gabbay@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: [PATCH 2/4] iommu/amd: Correctly set flags for handle_mm_fault call

From: Joerg Roedel <jroedel@...e.de>

Instead of just checking for a write access, calculate the
flags that are passed to handle_mm_fault() more precisly and
use the pre-defined macros.

Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
 drivers/iommu/amd_iommu_v2.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 7caf2fa..a7edbd6 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -513,16 +513,20 @@ static bool access_error(struct vm_area_struct *vma, struct fault *fault)
 static void do_fault(struct work_struct *work)
 {
 	struct fault *fault = container_of(work, struct fault, work);
-	struct mm_struct *mm;
 	struct vm_area_struct *vma;
+	unsigned int flags = 0;
+	struct mm_struct *mm;
 	u64 address;
-	int ret, write;
-
-	write = !!(fault->flags & PPR_FAULT_WRITE);
+	int ret;
 
 	mm = fault->state->mm;
 	address = fault->address;
 
+	if (fault->flags & PPR_FAULT_USER)
+		flags |= FAULT_FLAG_USER;
+	if (fault->flags & PPR_FAULT_WRITE)
+		flags |= FAULT_FLAG_WRITE;
+
 	down_read(&mm->mmap_sem);
 	vma = find_extend_vma(mm, address);
 	if (!vma || address < vma->vm_start) {
@@ -539,7 +543,7 @@ static void do_fault(struct work_struct *work)
 		goto out;
 	}
 
-	ret = handle_mm_fault(mm, vma, address, write);
+	ret = handle_mm_fault(mm, vma, address, flags);
 	if (ret & VM_FAULT_ERROR) {
 		/* failed to service fault */
 		up_read(&mm->mmap_sem);
-- 
1.9.1

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