linux-kernel - [PATCH] drivers:vfio: make the logic cleaner with braket

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Message-Id: <20220308094946.139059-1-jianchunfu@cmss.chinamobile.com>
Date:   Tue,  8 Mar 2022 17:49:46 +0800
From:   jianchunfu <jianchunfu@...s.chinamobile.com>
To:     alex.williamson@...hat.com
Cc:     cohuck@...hat.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        jianchunfu <jianchunfu@...s.chinamobile.com>
Subject: [PATCH] drivers:vfio: make the logic cleaner with braket

Use braket to avoid identifying operators in function
vfio_iova_dirty_bitmap() and vfio_dma_do_unmap()
when there are too many field values.

Signed-off-by: jianchunfu <jianchunfu@...s.chinamobile.com>
---
 drivers/vfio/vfio_iommu_type1.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 9394aa944..199547012 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -1251,7 +1251,7 @@ static int vfio_iova_dirty_bitmap(u64 __user *bitmap, struct vfio_iommu *iommu,
 		return -EINVAL;
 
 	dma = vfio_find_dma(iommu, iova + size - 1, 0);
-	if (dma && dma->iova + dma->size != iova + size)
+	if (dma && (dma->iova + dma->size) != (iova + size))
 		return -EINVAL;
 
 	for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) {
@@ -1363,7 +1363,7 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
 			goto unlock;
 
 		dma = vfio_find_dma(iommu, iova + size - 1, 0);
-		if (dma && dma->iova + dma->size != iova + size)
+		if (dma && (dma->iova + dma->size) != (iova + size))
 			goto unlock;
 	}
 
@@ -2958,7 +2958,7 @@ static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu,
 			ret = -EINVAL;
 			goto out_unlock;
 		}
-		if (!range.size || range.size & (iommu_pgsize - 1)) {
+		if (!range.size || (range.size & (iommu_pgsize - 1))) {
 			ret = -EINVAL;
 			goto out_unlock;
 		}
-- 
2.18.4