From 00085f1efa387a8ce100e3734920f7639c80caa3 Mon Sep 17 00:00:00 2001 From: Krzysztof Kozlowski Date: Wed, 3 Aug 2016 13:46:00 -0700 Subject: dma-mapping: use unsigned long for dma_attrs The dma-mapping core and the implementations do not change the DMA attributes passed by pointer. Thus the pointer can point to const data. However the attributes do not have to be a bitfield. Instead unsigned long will do fine: 1. This is just simpler. Both in terms of reading the code and setting attributes. Instead of initializing local attributes on the stack and passing pointer to it to dma_set_attr(), just set the bits. 2. It brings safeness and checking for const correctness because the attributes are passed by value. Semantic patches for this change (at least most of them): virtual patch virtual context @r@ identifier f, attrs; @@ f(..., - struct dma_attrs *attrs + unsigned long attrs , ...) { ... } @@ identifier r.f; @@ f(..., - NULL + 0 ) and // Options: --all-includes virtual patch virtual context @r@ identifier f, attrs; type t; @@ t f(..., struct dma_attrs *attrs); @@ identifier r.f; @@ f(..., - NULL + 0 ) Link: http://lkml.kernel.org/r/1468399300-5399-2-git-send-email-k.kozlowski@samsung.com Signed-off-by: Krzysztof Kozlowski Acked-by: Vineet Gupta Acked-by: Robin Murphy Acked-by: Hans-Christian Noren Egtvedt Acked-by: Mark Salter [c6x] Acked-by: Jesper Nilsson [cris] Acked-by: Daniel Vetter [drm] Reviewed-by: Bart Van Assche Acked-by: Joerg Roedel [iommu] Acked-by: Fabien Dessenne [bdisp] Reviewed-by: Marek Szyprowski [vb2-core] Acked-by: David Vrabel [xen] Acked-by: Konrad Rzeszutek Wilk [xen swiotlb] Acked-by: Joerg Roedel [iommu] Acked-by: Richard Kuo [hexagon] Acked-by: Geert Uytterhoeven [m68k] Acked-by: Gerald Schaefer [s390] Acked-by: Bjorn Andersson Acked-by: Hans-Christian Noren Egtvedt [avr32] Acked-by: Vineet Gupta [arc] Acked-by: Robin Murphy [arm64 and dma-iommu] Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/media/platform/sti/bdisp/bdisp-hw.c | 26 ++++++++------------------ 1 file changed, 8 insertions(+), 18 deletions(-) (limited to 'drivers/media/platform/sti') diff --git a/drivers/media/platform/sti/bdisp/bdisp-hw.c b/drivers/media/platform/sti/bdisp/bdisp-hw.c index 3df66d11c795..b7892f3efd98 100644 --- a/drivers/media/platform/sti/bdisp/bdisp-hw.c +++ b/drivers/media/platform/sti/bdisp/bdisp-hw.c @@ -430,14 +430,11 @@ int bdisp_hw_get_and_clear_irq(struct bdisp_dev *bdisp) */ void bdisp_hw_free_nodes(struct bdisp_ctx *ctx) { - if (ctx && ctx->node[0]) { - DEFINE_DMA_ATTRS(attrs); - - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + if (ctx && ctx->node[0]) dma_free_attrs(ctx->bdisp_dev->dev, sizeof(struct bdisp_node) * MAX_NB_NODE, - ctx->node[0], ctx->node_paddr[0], &attrs); - } + ctx->node[0], ctx->node_paddr[0], + DMA_ATTR_WRITE_COMBINE); } /** @@ -455,12 +452,10 @@ int bdisp_hw_alloc_nodes(struct bdisp_ctx *ctx) unsigned int i, node_size = sizeof(struct bdisp_node); void *base; dma_addr_t paddr; - DEFINE_DMA_ATTRS(attrs); /* Allocate all the nodes within a single memory page */ - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); base = dma_alloc_attrs(dev, node_size * MAX_NB_NODE, &paddr, - GFP_KERNEL | GFP_DMA, &attrs); + GFP_KERNEL | GFP_DMA, DMA_ATTR_WRITE_COMBINE); if (!base) { dev_err(dev, "%s no mem\n", __func__); return -ENOMEM; @@ -493,13 +488,9 @@ void bdisp_hw_free_filters(struct device *dev) { int size = (BDISP_HF_NB * NB_H_FILTER) + (BDISP_VF_NB * NB_V_FILTER); - if (bdisp_h_filter[0].virt) { - DEFINE_DMA_ATTRS(attrs); - - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + if (bdisp_h_filter[0].virt) dma_free_attrs(dev, size, bdisp_h_filter[0].virt, - bdisp_h_filter[0].paddr, &attrs); - } + bdisp_h_filter[0].paddr, DMA_ATTR_WRITE_COMBINE); } /** @@ -516,12 +507,11 @@ int bdisp_hw_alloc_filters(struct device *dev) unsigned int i, size; void *base; dma_addr_t paddr; - DEFINE_DMA_ATTRS(attrs); /* Allocate all the filters within a single memory page */ size = (BDISP_HF_NB * NB_H_FILTER) + (BDISP_VF_NB * NB_V_FILTER); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); - base = dma_alloc_attrs(dev, size, &paddr, GFP_KERNEL | GFP_DMA, &attrs); + base = dma_alloc_attrs(dev, size, &paddr, GFP_KERNEL | GFP_DMA, + DMA_ATTR_WRITE_COMBINE); if (!base) return -ENOMEM; -- cgit v1.2.3