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authorKrzysztof Kozlowski <k.kozlowski@samsung.com>2016-08-03 13:46:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-04 08:50:07 -0400
commit00085f1efa387a8ce100e3734920f7639c80caa3 (patch)
tree41ff3d6e6884918b4fc4f1ae96a284098167c5b0 /drivers/gpu/drm/msm
parent1605d2715ad2e67ddd0485a26e05ed670a4285ca (diff)
downloadop-kernel-dev-00085f1efa387a8ce100e3734920f7639c80caa3.zip
op-kernel-dev-00085f1efa387a8ce100e3734920f7639c80caa3.tar.gz
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 <k.kozlowski@samsung.com> Acked-by: Vineet Gupta <vgupta@synopsys.com> Acked-by: Robin Murphy <robin.murphy@arm.com> Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> Acked-by: Mark Salter <msalter@redhat.com> [c6x] Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> [cris] Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> [drm] Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Acked-by: Joerg Roedel <jroedel@suse.de> [iommu] Acked-by: Fabien Dessenne <fabien.dessenne@st.com> [bdisp] Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com> [vb2-core] Acked-by: David Vrabel <david.vrabel@citrix.com> [xen] Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> [xen swiotlb] Acked-by: Joerg Roedel <jroedel@suse.de> [iommu] Acked-by: Richard Kuo <rkuo@codeaurora.org> [hexagon] Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k] Acked-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> [s390] Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org> Acked-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no> [avr32] Acked-by: Vineet Gupta <vgupta@synopsys.com> [arc] Acked-by: Robin Murphy <robin.murphy@arm.com> [arm64 and dma-iommu] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpu/drm/msm')
-rw-r--r--drivers/gpu/drm/msm/msm_drv.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 26f859e..8a02370 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -238,11 +238,10 @@ static int msm_drm_uninit(struct device *dev)
}
if (priv->vram.paddr) {
- DEFINE_DMA_ATTRS(attrs);
- dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
+ unsigned long attrs = DMA_ATTR_NO_KERNEL_MAPPING;
drm_mm_takedown(&priv->vram.mm);
dma_free_attrs(dev, priv->vram.size, NULL,
- priv->vram.paddr, &attrs);
+ priv->vram.paddr, attrs);
}
component_unbind_all(dev, ddev);
@@ -310,21 +309,21 @@ static int msm_init_vram(struct drm_device *dev)
}
if (size) {
- DEFINE_DMA_ATTRS(attrs);
+ unsigned long attrs = 0;
void *p;
priv->vram.size = size;
drm_mm_init(&priv->vram.mm, 0, (size >> PAGE_SHIFT) - 1);
- dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
- dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
+ attrs |= DMA_ATTR_NO_KERNEL_MAPPING;
+ attrs |= DMA_ATTR_WRITE_COMBINE;
/* note that for no-kernel-mapping, the vaddr returned
* is bogus, but non-null if allocation succeeded:
*/
p = dma_alloc_attrs(dev->dev, size,
- &priv->vram.paddr, GFP_KERNEL, &attrs);
+ &priv->vram.paddr, GFP_KERNEL, attrs);
if (!p) {
dev_err(dev->dev, "failed to allocate VRAM\n");
priv->vram.paddr = 0;
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