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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-13 01:13:55 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-13 01:13:55 +0300
commit9e3a25dc992dd9f3170fb643bdd95da5ca9c5576 (patch)
treef636ae59fa83c83e837a6668b2693175a6e39f3a /arch/arm/mm/dma-mapping.c
parent9787aed57dd33ba5c15a713c2c50e78baeb5052d (diff)
parent15ffe5e1acf5fe1512e98b20702e46ce9f25e2f7 (diff)
downloadlinux-9e3a25dc992dd9f3170fb643bdd95da5ca9c5576.tar.xz
Merge tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping updates from Christoph Hellwig: - move the USB special case that bounced DMA through a device bar into the USB code instead of handling it in the common DMA code (Laurentiu Tudor and Fredrik Noring) - don't dip into the global CMA pool for single page allocations (Nicolin Chen) - fix a crash when allocating memory for the atomic pool failed during boot (Florian Fainelli) - move support for MIPS-style uncached segments to the common code and use that for MIPS and nios2 (me) - make support for DMA_ATTR_NON_CONSISTENT and DMA_ATTR_NO_KERNEL_MAPPING generic (me) - convert nds32 to the generic remapping allocator (me) * tag 'dma-mapping-5.3' of git://git.infradead.org/users/hch/dma-mapping: (29 commits) dma-mapping: mark dma_alloc_need_uncached as __always_inline MIPS: only select ARCH_HAS_UNCACHED_SEGMENT for non-coherent platforms usb: host: Fix excessive alignment restriction for local memory allocations lib/genalloc.c: Add algorithm, align and zeroed family of DMA allocators nios2: use the generic uncached segment support in dma-direct nds32: use the generic remapping allocator for coherent DMA allocations arc: use the generic remapping allocator for coherent DMA allocations dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code dma-direct: handle DMA_ATTR_NON_CONSISTENT in common code dma-mapping: add a dma_alloc_need_uncached helper openrisc: remove the partial DMA_ATTR_NON_CONSISTENT support arc: remove the partial DMA_ATTR_NON_CONSISTENT support arm-nommu: remove the partial DMA_ATTR_NON_CONSISTENT support ARM: dma-mapping: allow larger DMA mask than supported dma-mapping: truncate dma masks to what dma_addr_t can hold iommu/dma: Apply dma_{alloc,free}_contiguous functions dma-remap: Avoid de-referencing NULL atomic_pool MIPS: use the generic uncached segment support in dma-direct dma-direct: provide generic support for uncached kernel segments au1100fb: fix DMA API abuse ...
Diffstat (limited to 'arch/arm/mm/dma-mapping.c')
-rw-r--r--arch/arm/mm/dma-mapping.c20
1 files changed, 1 insertions, 19 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 1fb5c0ca1ed8..4789c60a86e3 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -216,25 +216,7 @@ EXPORT_SYMBOL(arm_coherent_dma_ops);
static int __dma_supported(struct device *dev, u64 mask, bool warn)
{
- unsigned long max_dma_pfn;
-
- /*
- * If the mask allows for more memory than we can address,
- * and we actually have that much memory, then we must
- * indicate that DMA to this device is not supported.
- */
- if (sizeof(mask) != sizeof(dma_addr_t) &&
- mask > (dma_addr_t)~0 &&
- dma_to_pfn(dev, ~0) < max_pfn - 1) {
- if (warn) {
- dev_warn(dev, "Coherent DMA mask %#llx is larger than dma_addr_t allows\n",
- mask);
- dev_warn(dev, "Driver did not use or check the return value from dma_set_coherent_mask()?\n");
- }
- return 0;
- }
-
- max_dma_pfn = min(max_pfn, arm_dma_pfn_limit);
+ unsigned long max_dma_pfn = min(max_pfn, arm_dma_pfn_limit);
/*
* Translate the device's DMA mask to a PFN limit. This