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linux/kernel/dma
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Baochen Qiang ca3c033a4f dma-mapping: fix missing clear bdr in check_ram_in_range_map() 
[ Upstream commit 8324993f60 ]

As discussed in [1], if 'bdr' is set once, it would never get
cleared, hence 0 is always returned.

Refactor the range check hunk into a new helper dma_find_range(),
which allows 'bdr' to be cleared in each iteration.

Link: https://lore.kernel.org/all/64931fac-085b-4ff3-9314-84bac2fa9bdb@quicinc.com/ # [1]
Fixes: a409d96009 ("dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover all system RAM")
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Baochen Qiang <quic_bqiang@quicinc.com>
Link: https://lore.kernel.org/r/20250307030350.69144-1-quic_bqiang@quicinc.com
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-03-28 22:03:26 +01:00
..
coherent.c dma-mapping: save base/size instead of pointer to shared DMA pool 2025-02-08 09:58:17 +01:00
contiguous.c mm/cma: drop CONFIG_CMA_DEBUG 2024-02-22 10:24:53 -08:00
debug.c dma-debug: fix a possible deadlock on radix_lock 2024-12-14 20:03:52 +01:00
debug.h dma-debug: teach add_dma_entry() about DMA_ATTR_SKIP_CPU_SYNC 2021-10-18 12:46:45 +02:00
direct.c dma-mapping: fix missing clear bdr in check_ram_in_range_map() 2025-03-28 22:03:26 +01:00
direct.h swiotlb: reduce swiotlb pool lookups 2024-07-10 07:59:03 +02:00
dummy.c dma-mapping: call ->unmap_page and ->unmap_sg unconditionally 2024-08-22 06:18:11 +02:00
Kconfig dma-mapping: clearly mark DMA ops as an architecture feature 2024-09-04 07:08:51 +03:00
Makefile dma-mapping: clearly mark DMA ops as an architecture feature 2024-09-04 07:08:51 +03:00
map_benchmark.c dma-mapping: benchmark: Don't starve others when doing the test 2024-07-09 07:48:32 +02:00
mapping.c dma-mapping: report unlimited DMA addressing in IOMMU DMA path 2024-09-23 08:38:56 +02:00
ops_helpers.c dma-mapping: use IOMMU DMA calls for common alloc/free page calls 2024-09-05 14:29:42 +03:00
pool.c dma-mapping: replace zone_dma_bits by zone_dma_limit 2024-08-22 06:18:00 +02:00
remap.c dma-mapping: use bit masking to check VM_DMA_COHERENT 2024-08-22 06:15:35 +02:00
swiotlb.c dma-mapping: replace zone_dma_bits by zone_dma_limit 2024-08-22 06:18:00 +02:00