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dma-mapping: direct: fix missing mapping for THRU_HOST_BRIDGE segments

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[ Upstream commit 560000d619 ]

In dma_direct_map_sg(), the case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE
incorrectly used 'break' instead of falling through to MAP_NONE.
As a result, segments traversing the host bridge skipped the required
dma_direct_map_phys() call entirely, leaving sg->dma_address
uninitialized and leading to DMA failures. Fix this by using
'fallthrough;'.

Fixes: a25e7962db ("PCI/P2PDMA: Refactor the p2pdma mapping helpers")
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260603013723.2439-1-lirongqing@baidu.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Li RongQing
2026-06-19 13:43:57 +02:00
committed by Greg Kroah-Hartman
parent 8d9a79fbf5
commit 4ee4d628c4
1 changed files with 1 additions and 1 deletions
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kernel/dma/direct.c
+1 -1
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@@ -469,7 +469,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
* must be mapped with CPU physical address and not PCI
* bus addresses.
*/
break;
fallthrough;
case PCI_P2PDMA_MAP_NONE:
sg->dma_address = dma_direct_map_phys(dev, sg_phys(sg),
sg->length, dir, attrs);