https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: ba4f184e126b751d1bffad5897f263108befc780 authored by Linus Torvalds on 20 September 2020, 23:33:55 UTC
Linux 5.9-rc6
Linux 5.9-rc6
Tip revision: ba4f184
dummy.c
// SPDX-License-Identifier: GPL-2.0
/*
* Dummy DMA ops that always fail.
*/
#include <linux/dma-mapping.h>
static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t dma_addr, size_t size,
unsigned long attrs)
{
return -ENXIO;
}
static dma_addr_t dma_dummy_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size, enum dma_data_direction dir,
unsigned long attrs)
{
return DMA_MAPPING_ERROR;
}
static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,
int nelems, enum dma_data_direction dir,
unsigned long attrs)
{
return 0;
}
static int dma_dummy_supported(struct device *hwdev, u64 mask)
{
return 0;
}
const struct dma_map_ops dma_dummy_ops = {
.mmap = dma_dummy_mmap,
.map_page = dma_dummy_map_page,
.map_sg = dma_dummy_map_sg,
.dma_supported = dma_dummy_supported,
};
EXPORT_SYMBOL(dma_dummy_ops);