linux-kernel - [PATCH] iommu/dma: Prune redundant pgprot arguments

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Date: Tue,  4 Jun 2024 13:39:09 +0100
From: Robin Murphy <robin.murphy@....com>
To: joro@...tes.org
Cc: will@...nel.org,
	hch@...radead.org,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH] iommu/dma: Prune redundant pgprot arguments

Somewhere amongst previous refactorings, the pgprot value in
__iommu_dma_alloc_noncontiguous() became entirely unused, and the one
used in iommu_dma_alloc_remap() can be computed locally rather than by
its one remaining caller. Clean 'em up.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/dma-iommu.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index f731e4b2a417..a30a2f3c8f97 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -939,8 +939,7 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev,
  * but an IOMMU which supports smaller pages might not map the whole thing.
  */
 static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
-		size_t size, struct sg_table *sgt, gfp_t gfp, pgprot_t prot,
-		unsigned long attrs)
+		size_t size, struct sg_table *sgt, gfp_t gfp, unsigned long attrs)
 {
 	struct iommu_domain *domain = iommu_get_dma_domain(dev);
 	struct iommu_dma_cookie *cookie = domain->iova_cookie;
@@ -1014,15 +1013,14 @@ static struct page **__iommu_dma_alloc_noncontiguous(struct device *dev,
 }
 
 static void *iommu_dma_alloc_remap(struct device *dev, size_t size,
-		dma_addr_t *dma_handle, gfp_t gfp, pgprot_t prot,
-		unsigned long attrs)
+		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
 {
 	struct page **pages;
 	struct sg_table sgt;
 	void *vaddr;
+	pgprot_t prot = dma_pgprot(dev, PAGE_KERNEL, attrs);
 
-	pages = __iommu_dma_alloc_noncontiguous(dev, size, &sgt, gfp, prot,
-						attrs);
+	pages = __iommu_dma_alloc_noncontiguous(dev, size, &sgt, gfp, attrs);
 	if (!pages)
 		return NULL;
 	*dma_handle = sgt.sgl->dma_address;
@@ -1049,8 +1047,7 @@ static struct sg_table *iommu_dma_alloc_noncontiguous(struct device *dev,
 	if (!sh)
 		return NULL;
 
-	sh->pages = __iommu_dma_alloc_noncontiguous(dev, size, &sh->sgt, gfp,
-						    PAGE_KERNEL, attrs);
+	sh->pages = __iommu_dma_alloc_noncontiguous(dev, size, &sh->sgt, gfp, attrs);
 	if (!sh->pages) {
 		kfree(sh);
 		return NULL;
@@ -1619,8 +1616,7 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
 
 	if (gfpflags_allow_blocking(gfp) &&
 	    !(attrs & DMA_ATTR_FORCE_CONTIGUOUS)) {
-		return iommu_dma_alloc_remap(dev, size, handle, gfp,
-				dma_pgprot(dev, PAGE_KERNEL, attrs), attrs);
+		return iommu_dma_alloc_remap(dev, size, handle, gfp, attrs);
 	}
 
 	if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
-- 
2.39.2.101.g768bb238c484.dirty